{"id":157,"title":"PHP\u9ad8\u6548\u7387\u5199\u6cd5","good":0,"bad":0,"hit":1543,"created_at":"2016-01-09 22:19:57","content":"<p>\u9605\u8bfb\u76ee\u5f55<\/p><p><ul><li><p>1.\u5c3d\u91cf\u9759\u6001\u5316\uff1a<\/p><\/li><li><p>2.echo\u7684\u6548\u7387\u9ad8\u4e8eprint,\u56e0\u4e3aecho\u6ca1\u6709\u8fd4\u56de\u503c\uff0cprint\u8fd4\u56de\u4e00\u4e2a\u6574\u578b;<\/p><\/li><li><p>3.\u5728\u5faa\u73af\u4e4b\u524d\u8bbe\u7f6e\u5faa\u73af\u7684\u6700\u5927\u6b21\u6570\uff0c\u800c\u975e\u5728\u5728\u5faa\u73af\u4e2d;<\/p><\/li><li><p>4.\u9500\u6bc1\u53d8\u91cf\u53bb\u91ca\u653e\u5185\u5b58\uff0c\u7279\u522b\u662f\u5927\u7684\u6570\u7ec4;<\/p><\/li><li><p>5.\u907f\u514d\u4f7f\u7528\u50cf__get, __set, __autoload\u7b49\u9b54\u672f\u65b9\u6cd5;<\/p><\/li><li><p>6.requiere_once()\u6bd4\u8f83\u8017\u8d44\u6e90;<\/p><\/li><li><p>7.\u5728includes\u548crequires\u4e2d\u4f7f\u7528\u7edd\u5bf9\u8def\u5f84\u3002<\/p><\/li><li><p>8.\u5982\u679c\u4f60\u9700\u8981\u5f97\u5230\u811a\u672c\u6267\u884c\u65f6\u7684\u65f6\u95f4\uff0c$_SERVER[&#39;REQUSET_TIME&#39;]\u4f18\u4e8etime();<\/p><\/li><li><p>9.\u80fd\u7528PHP\u5185\u90e8\u5b57\u7b26\u4e32\u64cd\u4f5c\u51fd\u6570\u7684\u60c5\u51b5\u4e0b\uff0c\u5c3d\u91cf\u7528\u4ed6\u4eec\uff0c\u4e0d\u8981\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\uff1b \u56e0\u4e3a\u5176\u6548\u7387\u9ad8\u4e8e\u6b63\u5219;<\/p><\/li><li><p>10.str_replace\u5b57\u7b26\u66ff\u6362\u6bd4\u6b63\u5219\u66ff\u6362preg_replace\u5feb\uff0c\u4f46strtr\u6bd4str_replace\u53c8\u5feb1\/4;<\/p><\/li><li><p>11.\u53c2\u6570\u4e3a\u5b57\u7b26\u4e32<\/p><\/li><li><p>12.\u6700\u597d\u4e0d\u7528@\uff0c\u7528@\u63a9\u76d6\u9519\u8bef\u4f1a\u964d\u4f4e\u811a\u672c\u8fd0\u884c\u901f\u5ea6;<\/p><\/li><li><p>13.$row[&#39;id&#39;]\u6bd4$row[id]\u901f\u5ea6\u5feb7\u500d<\/p><\/li><li><p>14.\u5728\u5faa\u73af\u91cc\u522b\u7528\u51fd\u6570<\/p><\/li><li><p>16.\u5728\u7c7b\u7684\u65b9\u6cd5\u91cc\u5efa\u7acb\u5c40\u90e8\u53d8\u91cf\u901f\u5ea6\u6700\u5feb\uff0c\u51e0\u4e4e\u548c\u5728\u65b9\u6cd5\u91cc\u8c03\u7528\u5c40\u90e8\u53d8\u91cf\u4e00\u6837\u5feb;<\/p><\/li><li><p>17.\u5efa\u7acb\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u8981\u6bd4\u5c40\u90e8\u53d8\u91cf\u8981\u61622\u500d;<\/p><\/li><li><p>18.\u5efa\u7acb\u4e00\u4e2a\u5bf9\u8c61\u5c5e\u6027(\u7c7b\u91cc\u9762\u7684\u53d8\u91cf)\u4f8b\u5982($this-&gt;prop++)\u6bd4\u5c40\u90e8\u53d8\u91cf\u8981\u61623\u500d;<\/p><\/li><li><p>19.\u5efa\u7acb\u4e00\u4e2a\u672a\u58f0\u660e\u7684\u5c40\u90e8\u53d8\u91cf\u8981\u6bd4\u4e00\u4e2a\u5df2\u7ecf\u5b9a\u4e49\u8fc7\u7684\u5c40\u90e8\u53d8\u91cf\u61629-10\u500d<\/p><\/li><li><p>20.\u58f0\u660e\u4e00\u4e2a\u672a\u88ab\u4efb\u4f55\u4e00\u4e2a\u51fd\u6570\u4f7f\u7528\u8fc7\u7684\u5168\u5c40\u53d8\u91cf\u4e5f\u4f1a\u4f7f\u6027\u80fd\u964d\u4f4e(\u548c\u58f0\u660e\u76f8\u540c\u6570\u91cf\u7684\u5c40\u90e8\u53d8\u91cf\u4e00\u6837)\u3002<\/p><\/li><li><p>21.\u65b9\u6cd5\u7684\u6027\u80fd\u548c\u5728\u4e00\u4e2a\u7c7b\u91cc\u9762\u5b9a\u4e49\u7684\u65b9\u6cd5\u7684\u6570\u76ee\u6ca1\u6709\u5173\u7cfb<\/p><\/li><li><p>22.\u5728\u5b50\u7c7b\u91cc\u65b9\u6cd5\u7684\u6027\u80fd\u4f18\u4e8e\u5728\u57fa\u7c7b\u4e2d;<\/p><\/li><li><p>23.\u53ea\u8c03\u7528\u4e00\u4e2a\u53c2\u6570\u5e76\u4e14\u51fd\u6570\u4f53\u4e3a\u7a7a\u7684\u51fd\u6570\u8fd0\u884c\u82b1\u8d39\u7684\u65f6\u95f4\u7b49\u4e8e7-8\u6b21$localvar++\u8fd0\u7b97\uff0c\u800c\u4e00\u4e2a\u7c7b\u4f3c\u7684\u65b9\u6cd5(\u7c7b\u91cc\u7684\u51fd\u6570)\u8fd0\u884c\u7b49\u4e8e\u5927\u7ea615\u6b21$localvar++\u8fd0\u7b97;<\/p><\/li><li><p>24 \u7528\u5355\u5f15\u53f7\u4ee3\u66ff\u53cc\u5f15\u53f7\u6765\u5305\u542b\u5b57\u7b26\u4e32\uff0c\u8fd9\u6837\u505a\u4f1a\u66f4\u5feb\u4e00\u4e9b\u3002<\/p><\/li><li><p>25.\u5f53echo\u5b57\u7b26\u4e32\u65f6\u7528\u9017\u53f7\u4ee3\u66ff\u70b9\u8fde\u63a5\u7b26\u66f4\u5feb\u4e9b\u3002<\/p><\/li><li><p>26.Apache\u89e3\u6790\u4e00\u4e2aPHP\u811a\u672c\u7684\u65f6\u95f4\u8981\u6bd4\u89e3\u6790\u4e00\u4e2a\u9759\u6001HTML\u9875\u9762\u61622\u81f310\u500d\u3002<\/p><\/li><li><p>28.\u5c3d\u91cf\u4f7f\u7528\u7f13\u5b58\uff0c\u5efa\u8bae\u7528memcached\u3002<\/p><\/li><li><p>29.\u4f7f\u7528ip2long()\u548clong2ip()\u51fd\u6570\u628aIP\u5730\u5740\u8f6c\u6210\u6574\u578b\u5b58\u653e\u8fdb\u6570\u636e\u5e93\u800c\u975e\u5b57\u7b26\u578b\u3002<\/p><\/li><li><p>30.\u4f7f\u7528checkdnsrr()\u901a\u8fc7\u57df\u540d\u5b58\u5728\u6027\u6765\u786e\u8ba4\u90e8\u5206email\u5730\u5740\u7684\u6709\u6548\u6027<\/p><\/li><li><p>31.\u4f7f\u7528mysql_*\u7684\u6539\u826f\u51fd\u6570mysqli_*;<\/p><\/li><li><p>32.\u8bd5\u7740\u559c\u6b22\u4f7f\u7528\u4e09\u5143\u8fd0\u7b97\u7b26(?\uff1a);<\/p><\/li><li><p>33.\u662f\u5426\u9700\u8981PEAR<\/p><\/li><li><p>35.\u4f7f\u7528error_reporting(0)\u51fd\u6570\u6765\u9884\u9632\u6f5c\u5728\u7684\u654f\u611f\u4fe1\u606f\u663e\u793a\u7ed9\u7528\u6237\u3002<\/p><\/li><li><p>36.\u4f7f\u7528 gzcompress() \u548cgzuncompress()\u5bf9\u5bb9\u91cf\u5927\u7684\u5b57\u7b26\u4e32\u8fdb\u884c\u538b\u7f29(\u89e3\u538b)\u5728\u5b58\u8fdb(\u53d6\u51fa)\u6570\u636e\u5e93\u65f6\u3002<\/p><\/li><li><p>37.\u901a\u8fc7\u53c2\u6570\u53d8\u91cf\u5730\u5740\u5f97\u5f15\u7528\u6765\u4f7f\u4e00\u4e2a\u51fd\u6570\u6709\u591a\u4e2a\u8fd4\u56de\u503c\u3002<\/p><\/li><li><p>38.&nbsp;\u5b8c\u5168\u7406\u89e3\u9b54\u672f\u5f15\u7528\u548cSQL\u6ce8\u5165\u7684\u5371\u9669\u3002<\/p><\/li><li><p>39.\u67d0\u4e9b\u5730\u65b9\u4f7f\u7528isset\u4ee3\u66ffstrlen<\/p><\/li><li><p>40.\u4f7f\u7528++$i\u9012\u589e<\/p><\/li><li><p>40. \u4e0d\u8981\u968f\u4fbf\u5c31\u590d\u5236\u53d8\u91cf<\/p><\/li><li><p>41 \u4f7f\u7528\u9009\u62e9\u5206\u652f\u8bed\u53e5<\/p><\/li><li><p>42.\u5728\u53ef\u4ee5\u7528file_get_contents\u66ff\u4ee3file\u3001fopen\u3001feof\u3001fgets<\/p><\/li><li><p>43.\u5c3d\u91cf\u7684\u5c11\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c\uff0c\u867d\u7136PHP\u7684\u6587\u4ef6\u64cd\u4f5c\u6548\u7387\u4e5f\u4e0d\u4f4e\u7684\uff1b<\/p><\/li><li><p>44.\u4f18\u5316Select SQL\u8bed\u53e5\uff0c\u5728\u53ef\u80fd\u7684\u60c5\u51b5\u4e0b\u5c3d\u91cf\u5c11\u7684\u8fdb\u884cInsert\u3001Update\u64cd\u4f5c(\u5728update\u4e0a\uff0c\u6211\u88ab\u6076\u6279\u8fc7)\uff1b<\/p><\/li><li><p>45.\u5c3d\u53ef\u80fd\u7684\u4f7f\u7528PHP\u5185\u90e8\u51fd\u6570<\/p><\/li><li><p>46.\u5faa\u73af\u5185\u90e8\u4e0d\u8981\u58f0\u660e\u53d8\u91cf\uff0c\u5c24\u5176\u662f\u5927\u53d8\u91cf\uff1a\u5bf9\u8c61<\/p><\/li><li><p>47.\u591a\u7ef4\u6570\u7ec4\u5c3d\u91cf\u4e0d\u8981\u5faa\u73af\u5d4c\u5957\u8d4b\u503c\uff1b<\/p><\/li><li><p>48.foreach\u6548\u7387\u66f4\u9ad8\uff0c\u5c3d\u91cf\u7528foreach\u4ee3\u66ffwhile\u548cfor\u5faa\u73af\uff1b<\/p><\/li><li><p>49.\u201c\u7528i+=1\u4ee3\u66ffi=i+1\u3002\u7b26\u5408c\/c++\u7684\u4e60\u60ef\uff0c\u6548\u7387\u8fd8\u9ad8\u201d\uff1b<\/p><\/li><li><p>50.\u5bf9global\u53d8\u91cf\uff0c\u5e94\u8be5\u7528\u5b8c\u5c31unset()\u6389\uff1b<\/p><\/li><li><p>51 \u5e76\u4e0d\u662f\u4e8b\u5fc5\u9762\u5411\u5bf9\u8c61(OOP)\uff0c\u9762\u5411\u5bf9\u8c61\u5f80\u5f80\u5f00\u9500\u5f88\u5927\uff0c\u6bcf\u4e2a\u65b9\u6cd5\u548c\u5bf9\u8c61\u8c03\u7528\u90fd\u4f1a\u6d88\u8017\u5f88\u591a\u5185\u5b58\u3002<\/p><\/li><li><p>52 \u4e0d\u8981\u628a\u65b9\u6cd5\u7ec6\u5206\u5f97\u8fc7\u591a\uff0c\u4ed4\u7ec6\u60f3\u60f3\u4f60\u771f\u6b63\u6253\u7b97\u91cd\u7528\u7684\u662f\u54ea\u4e9b\u4ee3\u7801\uff1f<\/p><\/li><li><p>53 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&nbsp;\u5f53\u7136\u4e86\uff0c\u8fd9\u4e2a\u6d4b\u8bd5\u65b9\u6cd5\u9700\u8981\u5728\u5341\u4e07\u7ea7\u4ee5\u4e0a\u6b21\u6267\u884c\uff0c\u6548\u679c\u624d\u660e\u663e\u3002<br\/>&nbsp; &nbsp;\u5176\u5b9e\u9759\u6001\u65b9\u6cd5\u548c\u975e\u9759\u6001\u65b9\u6cd5\u7684\u6548\u7387\u4e3b\u8981\u533a\u522b\u5728\u5185\u5b58\uff1a\u9759\u6001\u65b9\u6cd5\u5728\u7a0b\u5e8f\u5f00\u59cb\u65f6\u751f\u6210\u5185\u5b58,\u5b9e\u4f8b\u65b9\u6cd5\u5728\u7a0b\u5e8f\u8fd0\u884c\u4e2d\u751f\u6210\u5185\u5b58\uff0c\u6240\u4ee5\u9759\u6001\u65b9\u6cd5\u53ef\u4ee5\u76f4\u63a5\u8c03\u7528,\u5b9e\u4f8b\u65b9\u6cd5\u8981\u5148\u6210\u751f\u5b9e\u4f8b,\u901a\u8fc7\u5b9e\u4f8b\u8c03\u7528\u65b9\u6cd5\uff0c\u9759\u6001\u901f\u5ea6\u5f88\u5feb\uff0c\u4f46\u662f\u591a\u4e86\u4f1a\u5360\u5185\u5b58\u3002<br\/>&nbsp; \u4efb\u4f55\u8bed\u8a00\u90fd\u662f\u5bf9\u5185\u5b58\u548c\u78c1\u76d8\u7684\u64cd\u4f5c,\u81f3\u4e8e\u662f\u5426\u9762\u5411\u5bf9\u8c61,\u53ea\u662f\u8f6f\u4ef6\u5c42\u7684\u95ee\u9898,\u5e95\u5c42\u90fd\u662f\u4e00\u6837\u7684,\u53ea\u662f\u5b9e\u73b0\u65b9\u6cd5\u4e0d\u540c\u3002\u9759\u6001\u5185\u5b58\u662f\u8fde\u7eed\u7684,\u56e0\u4e3a\u662f\u5728\u7a0b\u5e8f\u5f00\u59cb\u65f6\u5c31\u751f\u6210\u4e86,\u800c\u5b9e\u4f8b\u7533\u8bf7\u7684\u662f\u79bb\u6563\u7684\u7a7a\u95f4,\u6240\u4ee5\u5f53\u7136\u6ca1\u6709\u9759\u6001\u65b9\u6cd5\u5feb\u3002<br\/>&nbsp; &nbsp;\u9759\u6001\u65b9\u6cd5\u59cb\u7ec8\u8c03\u7528\u540c\u4e00\u5757\u5185\u5b58\uff0c\u5176\u7f3a\u70b9\u5c31\u662f\u4e0d\u80fd\u81ea\u52a8\u8fdb\u884c\u9500\u6bc1\uff0c\u800c\u662f\u5b9e\u4f8b\u5316\u53ef\u4ee5\u9500\u6bc1\u3002<br\/> <\/p><p>2.echo\u7684\u6548\u7387\u9ad8\u4e8eprint,\u56e0\u4e3aecho\u6ca1\u6709\u8fd4\u56de\u503c\uff0cprint\u8fd4\u56de\u4e00\u4e2a\u6574\u578b;<\/p><p>&nbsp; \u6d4b\u8bd5\uff1a<br\/>&nbsp; Echo<br\/>&nbsp; 0.000929 - 0.001255 s (\u5e73\u5747 0.001092 seconds)<br\/>&nbsp; Print<br\/>&nbsp; 0.000980 - 0.001396 seconds (\u5e73\u5747 0.001188 seconds)<br\/>&nbsp; \u76f8\u5dee8%\u5de6\u53f3\uff0c\u603b\u4f53\u4e0aecho\u662f\u6bd4\u8f83\u5feb\u7684\u3002<br\/>&nbsp; \u6ce8\u610f\uff0cecho\u5927\u5b57\u7b26\u4e32\u7684\u65f6\u5019\uff0c\u5982\u679c\u6ca1\u6709\u505a\u8c03\u6574\u5c31\u4e25\u91cd\u5f71\u54cd\u6027\u80fd\u3002\u4f7f\u7528\u6253\u5f00apached\u7684mod_deflate\u8fdb\u884c\u538b\u7f29\u6216\u8005\u6253\u5f00ob_start\u5148\u5c06\u5185\u5bb9\u653e\u8fdb\u7f13\u51b2\u533a\u3002<br\/> <\/p><p>3.\u5728\u5faa\u73af\u4e4b\u524d\u8bbe\u7f6e\u5faa\u73af\u7684\u6700\u5927\u6b21\u6570\uff0c\u800c\u975e\u5728\u5728\u5faa\u73af\u4e2d;<\/p><p>&nbsp; &nbsp; \u50bb\u5b50\u90fd\u660e\u767d\u7684\u9053\u7406\u3002<br\/> <\/p><p>4.\u9500\u6bc1\u53d8\u91cf\u53bb\u91ca\u653e\u5185\u5b58\uff0c\u7279\u522b\u662f\u5927\u7684\u6570\u7ec4;<\/p><p>&nbsp; \u6570\u7ec4\u548c\u5bf9\u8c61\u5728php\u7279\u522b\u5360\u5185\u5b58\u7684\uff0c\u8fd9\u4e2a\u7531\u4e8ephp\u7684\u5e95\u5c42\u7684zend\u5f15\u64ce\u5f15\u8d77\u7684\uff0c<br\/>&nbsp; \u4e00\u822c\u6765\u8bf4\uff0cPHP\u6570\u7ec4\u7684\u5185\u5b58\u5229\u7528\u7387\u53ea\u6709 1\/10, \u4e5f\u5c31\u662f\u8bf4\uff0c\u4e00\u4e2a\u5728C\u8bed\u8a00\u91cc\u9762100M \u5185\u5b58\u7684\u6570\u7ec4\uff0c\u5728PHP\u91cc\u9762\u5c31\u89811G\u3002<br\/>&nbsp; \u7279\u522b\u662f\u5728PHP\u4f5c\u4e3a\u540e\u53f0\u670d\u52a1\u5668\u7684\u7cfb\u7edf\u4e2d\uff0c\u7ecf\u5e38\u4f1a\u51fa\u73b0\u5185\u5b58\u8017\u8d39\u592a\u5927\u7684\u95ee\u9898\u3002<br\/> <\/p><p>5.\u907f\u514d\u4f7f\u7528\u50cf__get, __set, __autoload\u7b49\u9b54\u672f\u65b9\u6cd5;<\/p><p>&nbsp; \u5bf9\u4e8e__\u5f00\u5934\u7684\u51fd\u6570\u5c31\u547d\u540d\u4e3a\u9b54\u672f\u51fd\u6570\uff0c\u6b64\u7c7b\u51fd\u6570\u90fd\u5728\u7279\u5b9a\u7684\u6761\u4ef6\u4e0b\u521d\u8bbf\u7684\u3002\u603b\u5f97\u6765\u8bf4\uff0c\u6709\u4e0b\u9762\u51e0\u4e2a\u9b54\u672f\u51fd\u6570<br\/>&nbsp; \r\n__construct()\uff0c__destruct()\uff0c__get()\uff0c__set()\uff0c__unset()\uff0c__call()\uff0c__callStatic()\uff0c__sleep()\uff0c__wakeup()\uff0c__toString()\uff0c__set_state()\uff0c__clone()\uff0c__autoload()<\/p><p>&nbsp;\r\n &nbsp; \r\n&nbsp;\u5176\u5b9e\uff0c\u5982\u679c__autoload\u4e0d\u80fd\u9ad8\u6548\u7684\u5c06\u7c7b\u540d\u4e0e\u5b9e\u9645\u7684\u78c1\u76d8\u6587\u4ef6(\u6ce8\u610f\uff0c\u8fd9\u91cc\u6307\u5b9e\u9645\u7684\u78c1\u76d8\u6587\u4ef6\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u6587\u4ef6\u540d)\u5bf9\u5e94\u8d77\u6765\uff0c\u7cfb\u7edf\u5c06\u4e0d\u5f97\u4e0d\u505a\u5927\u91cf\u7684\u6587\r\n\u4ef6\u662f \u5426\u5b58\u5728(\u9700\u8981\u5728\u6bcf\u4e2ainclude \r\npath\u4e2d\u5305\u542b\u7684\u8def\u5f84\u4e2d\u53bb\u5bfb\u627e)\u7684\u5224\u65ad\uff0c\u800c\u5224\u65ad\u6587\u4ef6\u662f\u5426\u5b58\u5728\u9700\u8981\u505a\u78c1\u76d8I\/O\u64cd\u4f5c\uff0c\u4f17\u6240\u5468\u77e5\u78c1\u76d8I\/O\u64cd\u4f5c\u7684\u6548\u7387\u5f88\u4f4e\uff0c\u56e0\u6b64\u8fd9\u624d\u662f\u4f7f\u5f97autoload\u673a\r\n\u5236\u6548\u7387\u964d\u4f4e\u7684\u539f\u56e0\u3002<\/p><p>&nbsp; \u56e0\u6b64\uff0c\u6211\u4eec\u5728\u7cfb\u7edf\u8bbe\u8ba1\u65f6\uff0c\u9700\u8981\u5b9a\u4e49\u4e00\u5957\u6e05\u6670\u7684\u5c06\u7c7b\u540d\u4e0e\u5b9e\u9645\u78c1\u76d8\u6587\u4ef6\u6620\u5c04\u7684\u673a\u5236\u3002\u8fd9\u4e2a\u89c4\u5219\u8d8a\u7b80\u5355\u8d8a\u660e\u786e\uff0cautoload\u673a\u5236\u7684\u6548\u7387\u5c31\u8d8a\u9ad8\u3002<br\/>&nbsp; \u7ed3\u8bba\uff1aautoload\u673a\u5236\u5e76\u4e0d\u662f\u5929\u7136\u7684\u6548\u7387\u4f4e\u4e0b\uff0c\u53ea\u6709\u6ee5\u7528autoload\uff0c\u8bbe\u8ba1\u4e0d\u597d\u7684\u81ea\u52a8\u88c5\u8f7d\u51fd\u6570\u624d\u4f1a\u5bfc\u81f4\u5176\u6548\u7387\u7684\u964d\u4f4e.<br\/> <\/p><p>&nbsp; \u6240\u4ee5\u8bf4\u5c3d\u91cf\u907f\u514d\u4f7f\u7528__autoload\u9b54\u672f\u65b9\u6cd5\uff0c\u6709\u5f85\u5546\u69b7\u3002<\/p><p>6.requiere_once()\u6bd4\u8f83\u8017\u8d44\u6e90;<\/p><p>&nbsp; \u8fd9\u662f\u56e0\u4e3arequiere_once\u9700\u8981\u5224\u65ad\u8be5\u6587\u4ef6\u662f\u5426\u88ab\u5f15\u7528\u8fc7),\u6240\u4ee5\u80fd\u4e0d\u7528\u5c3d\u91cf\u4e0d\u7528\u3002\u5e38\u7528require\/include\u65b9\u6cd5\u907f\u514d\u3002<br\/> <\/p><p>7.\u5728includes\u548crequires\u4e2d\u4f7f\u7528\u7edd\u5bf9\u8def\u5f84\u3002<\/p><p>&nbsp; \u5982\u679c\u5305\u542b\u76f8\u5bf9\u8def\u5f84\uff0cPHP\u4f1a\u5728include_path\u91cc\u9762\u904d\u5386\u67e5\u627e\u6587\u4ef6\u3002<br\/>&nbsp; \u7528\u7edd\u5bf9\u8def\u5f84\u5c31\u4f1a\u907f\u514d\u6b64\u7c7b\u95ee\u9898\uff0c\u56e0\u6b64\u89e3\u6790\u64cd\u4f5c\u7cfb\u7edf\u8def\u5f84\u6240\u9700\u7684\u65f6\u95f4\u4f1a\u66f4\u5c11\u3002<br\/> <\/p><p>8.\u5982\u679c\u4f60\u9700\u8981\u5f97\u5230\u811a\u672c\u6267\u884c\u65f6\u7684\u65f6\u95f4\uff0c$_SERVER[&#39;REQUSET_TIME&#39;]\u4f18\u4e8etime();<\/p><p>&nbsp; \u53ef\u4ee5\u60f3\u8c61\u3002\u4e00\u4e2a\u662f\u73b0\u6210\u5c31\u53ef\u4ee5\u76f4\u63a5\u7528\uff0c\u4e00\u4e2a\u8fd8\u9700\u8981\u51fd\u6570\u5f97\u51fa\u7684\u7ed3\u679c\u3002<br\/> <\/p><p>9.\u80fd\u7528PHP\u5185\u90e8\u5b57\u7b26\u4e32\u64cd\u4f5c\u51fd\u6570\u7684\u60c5\u51b5\u4e0b\uff0c\u5c3d\u91cf\u7528\u4ed6\u4eec\uff0c\u4e0d\u8981\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\uff1b \u56e0\u4e3a\u5176\u6548\u7387\u9ad8\u4e8e\u6b63\u5219;<\/p><p>&nbsp;\u6ca1\u5f97\u8bf4\uff0c\u6b63\u5219\u6700\u8017\u6027\u80fd\u3002<br\/>&nbsp;\u6709\u6ca1\u6709\u4f60\u6f0f\u6389\u7684\u597d\u7528\u7684\u51fd\u6570\uff1f\u4f8b\u5982\uff1astrpbrk()strncasecmp()strpos()\/strrpos()\/stripos()\/strripos()\u52a0\u901f strtr\u5982\u679c\u9700\u8981\u8f6c\u6362\u7684\u5168\u662f\u5355\u4e2a\u5b57\u7b26\u7684\u65f6\u5019\uff0c<br\/>\u7528\u5b57\u7b26\u4e32\u800c\u4e0d\u662f\u6570\u7ec4\u6765\u505a strtr\uff1a<br\/>&lt;?php<br\/>$addr = strtr($addr, &quot;abcd&quot;, &quot;efgh&quot;); \/\/ good<br\/>$addr = strtr($addr, array(&#39;a&#39; =&gt; &#39;e&#39;, )); \/\/ bad<br\/>?&gt;<br\/>\u6548\u7387\u63d0\u5347\uff1a10 \u500d\u3002<br\/> <\/p><p>10.str_replace\u5b57\u7b26\u66ff\u6362\u6bd4\u6b63\u5219\u66ff\u6362preg_replace\u5feb\uff0c\u4f46strtr\u6bd4str_replace\u53c8\u5feb1\/4;<\/p><p>&nbsp; \u53e6\u5916\u4e0d\u8981\u505a\u65e0\u8c13\u7684\u66ff\u6362\u5373\u4f7f\u6ca1\u6709\u66ff\u6362\uff0cstr_replace \u4e5f\u4f1a\u4e3a\u5176\u53c2\u6570\u5206\u914d\u5185\u5b58\u3002\u5f88\u6162\uff01\u89e3\u51b3\u529e\u6cd5\uff1a<br\/>&nbsp; \u7528 strpos \u5148\u67e5\u627e(\u975e\u5e38\u5feb)\uff0c\u770b\u662f\u5426\u9700\u8981\u66ff\u6362\uff0c\u5982\u679c\u9700\u8981\uff0c\u518d\u66ff\u6362\u6548\u7387\uff1a- \u5982\u679c\u9700\u8981\u66ff\u6362\uff1a\u6548\u7387\u51e0\u4e4e\u76f8\u7b49\uff0c\u5dee\u522b\u5728 0.1% \u5de6\u53f3\u3002<br\/>&nbsp; \u5982\u679c\u4e0d\u9700\u8981\u66ff\u6362\uff1a\u7528 strpos \u5feb 200%\u3002<br\/> <\/p><p>11.\u53c2\u6570\u4e3a\u5b57\u7b26\u4e32<\/p><p>&nbsp; \u5982\u679c\u4e00\u4e2a\u51fd\u6570\u65e2\u80fd\u63a5\u53d7\u6570\u7ec4\u53c8\u80fd\u63a5\u53d7\u7b80\u5355\u5b57\u7b26\u505a\u4e3a\u53c2\u6570\uff0c\u4f8b\u5982\u5b57\u7b26\u66ff\u6362\u51fd\u6570\uff0c\u5e76\u4e14\u53c2\u6570\u5217\u8868\u4e0d\u662f\u592a\u957f\uff0c\u53ef\u4ee5\u8003\u8651\u989d\u5916\u5199\u4e00\u6bb5\u66ff\u6362\u4ee3\u7801\uff0c\u4f7f\u5f97\u6bcf\u6b21\u4f20\u9012\u53c2\u6570\u90fd\u662f\u4e00 &nbsp; \u4e2a\u5b57\u7b26\uff0c\u800c\u4e0d\u662f\u63a5\u53d7\u6570\u7ec4\u505a\u4e3a\u67e5\u627e\u548c\u66ff\u6362\u53c2\u6570\u3002\u5927\u4e8b\u5316\u5c0f\uff0c1+1&gt;2;<\/p><p>12.\u6700\u597d\u4e0d\u7528@\uff0c\u7528@\u63a9\u76d6\u9519\u8bef\u4f1a\u964d\u4f4e\u811a\u672c\u8fd0\u884c\u901f\u5ea6;<\/p><p>&nbsp; &nbsp;\u7528@\u5b9e\u9645\u4e0a\u540e\u53f0\u6709\u5f88\u591a\u64cd\u4f5c\u3002\u7528@\u6bd4\u8d77\u4e0d\u7528@\uff0c\u6548\u7387\u5dee\u8ddd\uff1a3 \u500d\u3002\u7279\u522b\u4e0d\u8981\u5728\u5faa\u73af\u4e2d\u4f7f\u7528@\uff0c\u5728 5 \u6b21\u5faa\u73af\u7684\u6d4b\u8bd5\u4e2d\uff0c\u5373\u4f7f\u662f\u5148\u7528 error_reporting(0) \u5173\u6389\u9519\u8bef\uff0c\u5728\u5faa\u73af\u5b8c\u6210\u540e\u518d\u6253\u5f00\uff0c\u90fd\u6bd4\u7528@\u5feb\u3002<br\/> <\/p><p>13.$row[&#39;id&#39;]\u6bd4$row[id]\u901f\u5ea6\u5feb7\u500d<\/p><p>&nbsp; &nbsp; \u5efa\u8bae\u517b\u6210\u6570\u7ec4\u952e\u52a0\u5f15\u53f7\u7684\u4e60\u60ef;<\/p><p>14.\u5728\u5faa\u73af\u91cc\u522b\u7528\u51fd\u6570<\/p><p>&nbsp; &nbsp;\u4f8b\u5982For($x=0; $x &lt; count($array); $x), count()\u51fd\u6570\u5728\u5916\u9762\u5148\u8ba1\u7b97;\u539f\u56e0\u4f60\u61c2\u7684\u3002<\/p><p>16.\u5728\u7c7b\u7684\u65b9\u6cd5\u91cc\u5efa\u7acb\u5c40\u90e8\u53d8\u91cf\u901f\u5ea6\u6700\u5feb\uff0c\u51e0\u4e4e\u548c\u5728\u65b9\u6cd5\u91cc\u8c03\u7528\u5c40\u90e8\u53d8\u91cf\u4e00\u6837\u5feb;<\/p><p>17.\u5efa\u7acb\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u8981\u6bd4\u5c40\u90e8\u53d8\u91cf\u8981\u61622\u500d;<\/p><p>&nbsp; \u7531\u4e8e\u5c40\u90e8\u53d8\u91cf\u662f\u5b58\u5728\u6808\u4e2d\u7684\uff0c\u5f53\u4e00\u4e2a\u51fd\u6570\u5360\u7528\u7684\u6808\u7a7a\u95f4\u4e0d\u662f\u5f88\u5927\u7684\u65f6\u5019\uff0c\u8fd9\u90e8\u5206\u5185\u5b58\u5f88\u6709\u53ef\u80fd\u5168\u90e8\u547d\u4e2dcache\uff0c\u8fd9\u65f6\u5019CPU\u8bbf\u95ee\u7684\u6548\u7387\u662f\u5f88\u9ad8\u7684\u3002<br\/>&nbsp; \u76f8\u53cd\uff0c\u5982\u679c\u4e00\u4e2a\u51fd\u6570\u91cc\u65e2\u4f7f\u7528\u4e86\u5168\u5c40\u53d8\u91cf\u53c8\u4f7f\u7528\u4e86\u5c40\u90e8\u53d8\u91cf\uff0c\u90a3\u4e48\u5f53\u8fd9\u4e24\u6bb5\u5730\u5740\u76f8\u5dee\u8f83\u5927\u65f6\uff0ccpu cache\u9700\u8981\u6765\u56de\u5207\u6362\uff0c\u90a3\u4e48\u6548\u7387\u4f1a\u4e0b\u964d\u3002<br\/>&nbsp; (\u6211\u7406\u89e3\u554a)<br\/><br\/> <\/p><p>18.\u5efa\u7acb\u4e00\u4e2a\u5bf9\u8c61\u5c5e\u6027(\u7c7b\u91cc\u9762\u7684\u53d8\u91cf)\u4f8b\u5982($this-&gt;prop++)\u6bd4\u5c40\u90e8\u53d8\u91cf\u8981\u61623\u500d;<\/p><p>19.\u5efa\u7acb\u4e00\u4e2a\u672a\u58f0\u660e\u7684\u5c40\u90e8\u53d8\u91cf\u8981\u6bd4\u4e00\u4e2a\u5df2\u7ecf\u5b9a\u4e49\u8fc7\u7684\u5c40\u90e8\u53d8\u91cf\u61629-10\u500d<\/p><p>20.\u58f0\u660e\u4e00\u4e2a\u672a\u88ab\u4efb\u4f55\u4e00\u4e2a\u51fd\u6570\u4f7f\u7528\u8fc7\u7684\u5168\u5c40\u53d8\u91cf\u4e5f\u4f1a\u4f7f\u6027\u80fd\u964d\u4f4e(\u548c\u58f0\u660e\u76f8\u540c\u6570\u91cf\u7684\u5c40\u90e8\u53d8\u91cf\u4e00\u6837)\u3002<\/p><p>&nbsp; &nbsp; PHP\u53ef\u80fd\u53bb\u68c0\u67e5\u8fd9\u4e2a\u5168\u5c40\u53d8\u91cf\u662f\u5426\u5b58\u5728;<\/p><p>21.\u65b9\u6cd5\u7684\u6027\u80fd\u548c\u5728\u4e00\u4e2a\u7c7b\u91cc\u9762\u5b9a\u4e49\u7684\u65b9\u6cd5\u7684\u6570\u76ee\u6ca1\u6709\u5173\u7cfb<\/p><p>&nbsp; \u56e0\u4e3a\u6211\u6dfb\u52a010\u4e2a\u6216\u591a\u4e2a\u65b9\u6cd5\u5230\u6d4b\u8bd5\u7684\u7c7b\u91cc\u9762(\u8fd9\u4e9b\u65b9\u6cd5\u5728\u6d4b\u8bd5\u65b9\u6cd5\u7684\u524d\u540e)\u540e\u6027\u80fd\u6ca1\u4ec0\u4e48\u5dee\u5f02;<\/p><p>22.\u5728\u5b50\u7c7b\u91cc\u65b9\u6cd5\u7684\u6027\u80fd\u4f18\u4e8e\u5728\u57fa\u7c7b\u4e2d;<\/p><p>23.\u53ea\u8c03\u7528\u4e00\u4e2a\u53c2\u6570\u5e76\u4e14\u51fd\u6570\u4f53\u4e3a\u7a7a\u7684\u51fd\u6570\u8fd0\u884c\u82b1\u8d39\u7684\u65f6\u95f4\u7b49\u4e8e7-8\u6b21$localvar++\u8fd0\u7b97\uff0c\u800c\u4e00\u4e2a\u7c7b\u4f3c\u7684\u65b9\u6cd5(\u7c7b\u91cc\u7684\u51fd\u6570)\u8fd0\u884c\u7b49\u4e8e\u5927\u7ea615\u6b21$localvar++\u8fd0\u7b97;<\/p><p>24 \u7528\u5355\u5f15\u53f7\u4ee3\u66ff\u53cc\u5f15\u53f7\u6765\u5305\u542b\u5b57\u7b26\u4e32\uff0c\u8fd9\u6837\u505a\u4f1a\u66f4\u5feb\u4e00\u4e9b\u3002<\/p><p>&nbsp; &nbsp;\u56e0\u4e3aPHP\u4f1a\u5728\u53cc\u5f15\u53f7\u5305\u56f4\u7684\u5b57\u7b26\u4e32\u4e2d\u641c\u5bfb\u53d8\u91cf\uff0c\u5355\u5f15\u53f7\u5219\u4e0d\u4f1a\u3002<\/p><p>&nbsp; &nbsp;PHP \u5f15\u64ce\u5141\u8bb8\u4f7f\u7528\u5355\u5f15\u53f7\u548c\u53cc\u5f15\u53f7\u6765\u5c01\u88c5\u5b57\u7b26\u4e32\u53d8\u91cf\uff0c\u4f46\u662f\u8fd9\u4e2a\u662f\u6709\u5f88\u5927\u7684\u5dee\u522b\u7684\uff01\u4f7f\u7528\u53cc\u5f15\u53f7\u7684\u5b57\u7b26\u4e32\u544a\u8bc9 PHP \u5f15\u64ce\u9996\u5148\u53bb\u8bfb\u53d6\u5b57\u7b26\u4e32\u5185\u5bb9\uff0c\u67e5\u627e\u5176\u4e2d\u7684\u53d8 &nbsp; &nbsp;\u91cf\uff0c\u5e76\u6539\u4e3a\u53d8\u91cf\u5bf9\u5e94\u7684\u503c\u3002\u4e00\u822c\u6765\u8bf4\u5b57\u7b26\u4e32\u662f\u6ca1\u6709\u53d8\u91cf\u7684\uff0c\u6240\u4ee5\u4f7f\u7528\u53cc\u5f15\u53f7\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0d\u4f73\u3002\u6700\u597d\u662f\u4f7f\u7528\u5b57<br\/>&nbsp; \u7b26\u4e32\u8fde\u63a5\u800c\u4e0d\u662f\u53cc\u5f15\u53f7\u5b57\u7b26\u4e32\u3002<br\/>BAD:<br\/>$output = &quot;This is a plain string&quot;;<br\/>GOOD:<br\/>$output = &#39;This is a plain string&#39;;<br\/>BAD:&nbsp;<br\/>$type = &quot;mixed&quot;;<br\/>$output = &quot;This is a $type string&quot;;<br\/>GOOD:<br\/>$type = &#39;mixed&#39;;<br\/>$output = &#39;This is a &#39; . $type .&#39; string&#39;;<br\/> <\/p><p>25.\u5f53echo\u5b57\u7b26\u4e32\u65f6\u7528\u9017\u53f7\u4ee3\u66ff\u70b9\u8fde\u63a5\u7b26\u66f4\u5feb\u4e9b\u3002<\/p><p>&nbsp; echo\u4e00\u79cd\u53ef\u4ee5\u628a\u591a\u4e2a\u5b57\u7b26\u4e32\u5f53\u4f5c\u53c2\u6570\u7684\u201c\u51fd\u6570\u201d\uff08\u8bd1\u6ce8\uff1aPHP\u624b\u518c\u4e2d\u8bf4echo\u662f\u8bed\u8a00\u7ed3\u6784\uff0c\u4e0d\u662f\u771f\u6b63\u7684\u51fd\u6570\uff0c\u6545\u628a\u51fd\u6570\u52a0\u4e0a\u4e86\u53cc\u5f15\u53f7\uff09\u3002<\/p><p>&nbsp; \u4f8b\u5982echo $str1,$str2\u3002<br\/> <\/p><p>26.Apache\u89e3\u6790\u4e00\u4e2aPHP\u811a\u672c\u7684\u65f6\u95f4\u8981\u6bd4\u89e3\u6790\u4e00\u4e2a\u9759\u6001HTML\u9875\u9762\u61622\u81f310\u500d\u3002<\/p><p>&nbsp; &nbsp; &nbsp;\u5c3d\u91cf\u591a\u7528\u9759\u6001HTML\u9875\u9762\uff0c\u5c11\u7528\u811a\u672c\u3002<\/p><p>28.\u5c3d\u91cf\u4f7f\u7528\u7f13\u5b58\uff0c\u5efa\u8bae\u7528memcached\u3002<\/p><p>&nbsp; &nbsp;\u9ad8\u6027\u80fd\u7684\u5206\u5e03\u5f0f\u5185\u5b58\u5bf9\u8c61\u7f13\u5b58\u7cfb\u7edf\uff0c\u63d0\u9ad8\u52a8\u6001\u7f51\u7edc\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\uff0c\u51cf\u8f7b\u6570\u636e\u5e93\u7684\u8d1f\u62c5;<\/p><p>&nbsp; &nbsp;\u4e5f\u5bf9\u8fd0\u7b97\u7801 (OP code)\u7684\u7f13\u5b58\u5f88\u6709\u7528\uff0c\u4f7f\u5f97\u811a\u672c\u4e0d\u5fc5\u4e3a\u6bcf\u4e2a\u8bf7\u6c42\u505a\u91cd\u65b0\u7f16\u8bd1\u3002<br\/> <\/p><p>29.\u4f7f\u7528ip2long()\u548clong2ip()\u51fd\u6570\u628aIP\u5730\u5740\u8f6c\u6210\u6574\u578b\u5b58\u653e\u8fdb\u6570\u636e\u5e93\u800c\u975e\u5b57\u7b26\u578b\u3002<\/p><p>&nbsp; &nbsp; &nbsp;\u8fd9\u51e0\u4e4e\u80fd\u964d\u4f4e1\/4\u7684\u5b58\u50a8\u7a7a\u95f4\u3002\u540c\u65f6\u53ef\u4ee5\u5f88\u5bb9\u6613\u5bf9\u5730\u5740\u8fdb\u884c\u6392\u5e8f\u548c\u5feb\u901f\u67e5\u627e;<\/p><p>30.\u4f7f\u7528checkdnsrr()\u901a\u8fc7\u57df\u540d\u5b58\u5728\u6027\u6765\u786e\u8ba4\u90e8\u5206email\u5730\u5740\u7684\u6709\u6548\u6027<\/p><p>&nbsp; &nbsp; \u8fd9\u4e2a\u5185\u7f6e\u51fd\u6570\u80fd\u4fdd\u8bc1\u6bcf\u4e00\u4e2a\u7684\u57df\u540d\u5bf9\u5e94\u4e00\u4e2aIP\u5730\u5740;<\/p><p>31.\u4f7f\u7528mysql_*\u7684\u6539\u826f\u51fd\u6570mysqli_*;<\/p><p>32.\u8bd5\u7740\u559c\u6b22\u4f7f\u7528\u4e09\u5143\u8fd0\u7b97\u7b26(?\uff1a);<\/p><p>33.\u662f\u5426\u9700\u8981PEAR<\/p><p>\u5728\u4f60\u60f3\u5728\u5f7b\u5e95\u91cd\u505a\u4f60\u7684\u9879\u76ee\u524d\uff0c\u770b\u770bPEAR\u6709\u6ca1\u6709\u4f60\u9700\u8981\u7684\u3002PEAR\u662f\u4e2a\u5de8\u5927\u7684\u8d44\u6e90\u5e93\uff0c\u5f88\u591aphp\u5f00\u53d1\u8005\u90fd\u77e5\u9053;<\/p><p><br\/> <\/p><p>35.\u4f7f\u7528error_reporting(0)\u51fd\u6570\u6765\u9884\u9632\u6f5c\u5728\u7684\u654f\u611f\u4fe1\u606f\u663e\u793a\u7ed9\u7528\u6237\u3002<\/p><p>&nbsp; \u7406\u60f3\u7684\u9519\u8bef\u62a5\u544a\u5e94\u8be5\u88ab\u5b8c\u5168\u7981\u7528\u5728php.ini\u6587\u4ef6\u91cc\u3002\u53ef\u662f\u5982\u679c\u4f60\u5728\u7528\u4e00\u4e2a\u5171\u4eab\u7684\u865a\u62df\u4e3b\u673a\uff0cphp.ini\u4f60\u4e0d\u80fd\u4fee\u6539\uff0c\u90a3\u4e48\u4f60\u6700\u597d\u6dfb\u52a0error_reporting(0)\u51fd\u6570\uff0c\u653e\u5728\u6bcf\u4e2a\u811a\u672c\u6587\u4ef6\u7684\u7b2c\u4e00\u884c(\u6216\u7528<\/p><p>require_once()\u6765\u52a0\u8f7d)\u8fd9\u80fd\u6709\u6548\u7684\u4fdd\u62a4\u654f\u611f\u7684SQL\u67e5\u8be2\u548c\u8def\u5f84\u5728\u51fa\u9519\u65f6\u4e0d\u88ab\u663e\u793a;<br\/> <\/p><p>36.\u4f7f\u7528 gzcompress() \u548cgzuncompress()\u5bf9\u5bb9\u91cf\u5927\u7684\u5b57\u7b26\u4e32\u8fdb\u884c\u538b\u7f29(\u89e3\u538b)\u5728\u5b58\u8fdb(\u53d6\u51fa)\u6570\u636e\u5e93\u65f6\u3002<\/p><p>&nbsp; &nbsp; \u8fd9\u79cd\u5185\u7f6e\u7684\u51fd\u6570\u4f7f\u7528gzip\u7b97\u6cd5\u80fd\u538b\u7f29\u523090%;<\/p><p>37.\u901a\u8fc7\u53c2\u6570\u53d8\u91cf\u5730\u5740\u5f97\u5f15\u7528\u6765\u4f7f\u4e00\u4e2a\u51fd\u6570\u6709\u591a\u4e2a\u8fd4\u56de\u503c\u3002<\/p><p>&nbsp; &nbsp;\u4f60\u53ef\u4ee5\u5728\u53d8\u91cf\u524d\u52a0\u4e2a\u201c&amp;\u201d\u6765\u8868\u793a\u6309\u5730\u5740\u4f20\u9012\u800c\u975e\u6309\u503c\u4f20\u9012;<\/p><p>38.&nbsp;\u5b8c\u5168\u7406\u89e3\u9b54\u672f\u5f15\u7528\u548cSQL\u6ce8\u5165\u7684\u5371\u9669\u3002<\/p><p>&nbsp; &nbsp; Fully understand \u201cmagic quotes\u201d and\r\n the dangers of SQL injection. I\u2019m hoping that most developers reading \r\nthis are already familiar with SQL injection. However, I list it here \r\nbecause it\u2019s absolutely critical to understand. If you\u2019ve never heard the term before, spend the entire rest of the day googling and reading.<\/p><p>39.\u67d0\u4e9b\u5730\u65b9\u4f7f\u7528isset\u4ee3\u66ffstrlen<\/p><p>&nbsp; \r\n\u5f53\u64cd\u4f5c\u5b57\u7b26\u4e32\u5e76\u9700\u8981\u68c0\u9a8c\u5176\u957f\u5ea6\u662f\u5426\u6ee1\u8db3\u67d0\u79cd\u8981\u6c42\u65f6\uff0c\u4f60\u60f3\u5f53\u7136\u5730\u4f1a\u4f7f\u7528strlen()\u51fd\u6570\u3002\u6b64\u51fd\u6570\u6267\u884c\u8d77\u6765\u76f8\u5f53\u5feb\uff0c\u56e0\u4e3a\u5b83\u4e0d\u505a\u4efb\u4f55\u8ba1\u7b97\uff0c\u53ea\u8fd4\u56de\u5728zval\r\n \r\n\u7ed3\u6784\uff08C\u7684\u5185\u7f6e\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u5b58\u50a8PHP\u53d8\u91cf\uff09\u4e2d\u5b58\u50a8\u7684\u5df2\u77e5\u5b57\u7b26\u4e32\u957f\u5ea6\u3002\u4f46\u662f\uff0c\u7531\u4e8estrlen()\u662f\u51fd\u6570\uff0c\u591a\u591a\u5c11\u5c11\u4f1a\u6709\u4e9b\u6162\uff0c\u56e0\u4e3a\u51fd\u6570\u8c03\u7528\u4f1a\u7ecf\u8fc7\u8bf8\u591a\u6b65\r\n\u9aa4\uff0c\u5982\u5b57\u6bcd\u5c0f\u5199\u5316\uff08\u8bd1\u6ce8\uff1a\u6307\u51fd\u6570\u540d\u5c0f\u5199\u5316\uff0cPHP\u4e0d\u533a\u5206\u51fd\u6570\u540d\u5927\u5c0f\u5199\uff09\u3001\u54c8\u5e0c\u67e5\u627e\uff0c\u4f1a\u8ddf\u968f\u88ab\u8c03\u7528\u7684\u51fd\u6570\u4e00\u8d77\u6267\u884c\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528isset()\r\n \u6280\u5de7\u52a0\u901f\u6267\u884c\u4f60\u7684\u4ee3\u7801\u3002<\/p><p>\uff08\u4e3e\u4f8b\u5982\u4e0b\uff09<br\/>if (strlen($foo) &lt; 5) { echo \u201cFoo is too short\u201d$$ }<br\/>\uff08\u4e0e\u4e0b\u9762\u7684\u6280\u5de7\u505a\u6bd4\u8f83\uff09<br\/>if (!isset($foo{5})) { echo \u201cFoo is too short\u201d$$ }<br\/>\u8c03\u7528isset()\u6070\u5de7\u6bd4strlen()\u5feb\uff0c\u56e0\u4e3a\u4e0e\u540e\u8005\u4e0d\u540c\u7684\u662f\uff0cisset()\u4f5c\u4e3a\u4e00\u79cd\u8bed\u8a00\u7ed3\u6784\uff0c\u610f\u5473\u7740\u5b83\u7684\u6267\u884c\u4e0d\u9700\u8981\u51fd\u6570\u67e5\u627e\u548c\u5b57\u6bcd\u5c0f\u5199\u5316\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5b9e\u9645\u4e0a\u5728\u68c0\u9a8c\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u9876\u5c42\u4ee3\u7801\u4e2d\u4f60\u6ca1\u6709\u82b1\u592a\u591a\u5f00\u9500\u3002<br\/> <\/p><p>40.\u4f7f\u7528++$i\u9012\u589e<\/p><p>When incrementing or decrementing the \r\nvalue of the variable $i++ happens to be a tad slower then ++$i. This is\r\n something PHP specific and does not apply to other languages, so don\u2019t \r\ngo modifying your C or Java code thinking it\u2019ll&nbsp;suddenly become faster, \r\nit won\u2019t. ++$i happens to be faster in PHP because instead of 4 opcodes \r\nused for $i++ you only need 3. Post incrementation actually causes in \r\nthe creation of a temporary var that is then incremented. While \r\npreincrementation increases the original value directly. This is one of \r\nthe optimization that opcode optimized like Zend\u2019s PHP optimizer. It is a\r\n still a good idea to keep in mind since not all opcode optimizers \r\nperform this optimization&nbsp;and there are plenty of ISPs and servers \r\nrunning without an opcode optimizer.<\/p><p>&nbsp; \r\n&nbsp;\u5f53\u6267\u884c\u53d8\u91cf$i\u7684\u9012\u589e\u6216\u9012\u51cf\u65f6\uff0c$i++\u4f1a\u6bd4++$i\u6162\u4e00\u4e9b\u3002\u8fd9\u79cd\u5dee\u5f02\u662fPHP\u7279\u6709\u7684\uff0c\u5e76\u4e0d\u9002\u7528\u4e8e\u5176\u4ed6\u8bed\u8a00\uff0c\u6240\u4ee5\u8bf7\u4e0d\u8981\u4fee\u6539\u4f60\u7684C\u6216Java\u4ee3\u7801\u5e76\u6307\u671b\r\n\u5b83\u4eec\u80fd\u7acb\u5373\u53d8\u5feb\uff0c\u6ca1\u7528\u7684\u3002++$i\u66f4\u5feb\u662f\u56e0\u4e3a\u5b83\u53ea\u9700\u89813\u6761\u6307\u4ee4(opcodes)\uff0c$i++\u5219\u9700\u89814\u6761\u6307\u4ee4\u3002\u540e\u7f6e\u9012\u589e\u5b9e\u9645\u4e0a\u4f1a\u4ea7\u751f\u4e00\u4e2a\u4e34\u65f6\u53d8\u91cf\uff0c\u8fd9\u4e2a\u4e34\u65f6\r\n\u53d8\u91cf\u968f\u540e\u88ab\u9012\u589e\u3002\u800c\u524d\u7f6e\u9012\u589e\u76f4\u63a5\u5728\u539f\u503c\u4e0a\u9012\u589e\u3002\u8fd9\u662f\u6700\u4f18\u5316\u5904\u7406\u7684\u4e00\u79cd\uff0c\u6b63\u5982Zend\u7684PHP\u4f18\u5316\u5668\u6240\u4f5c\u7684\u90a3\u6837\u3002\u7262\u8bb0\u8fd9\u4e2a\u4f18\u5316\u5904\u7406\u4e0d\u5931\u4e3a\u4e00\u4e2a\u597d\u4e3b\u610f\uff0c\u56e0\u4e3a\u5e76\r\n\u4e0d\u662f\u6240\u6709\u7684\u6307\u4ee4\u4f18\u5316\u5668\u90fd\u4f1a\u505a\u540c\u6837\u7684\u4f18\u5316\u5904\u7406\uff0c\u5e76\u4e14\u5b58\u5728\u5927\u91cf\u6ca1\u6709\u88c5\u914d\u6307\u4ee4\u4f18\u5316\u5668\u7684\u4e92\u8054\u7f51\u670d\u52a1<br\/>\u63d0\u4f9b\u5546\uff08ISPs\uff09\u548c\u670d\u52a1\u5668\u3002<br\/> <\/p><p>40. \u4e0d\u8981\u968f\u4fbf\u5c31\u590d\u5236\u53d8\u91cf<\/p><p>\u6709\u65f6\u5019\u4e3a\u4e86\u4f7f PHP \u4ee3\u7801\u66f4\u52a0\u6574\u6d01\uff0c\u4e00\u4e9b PHP \r\n\u65b0\u624b\uff08\u5305\u62ec\u6211\uff09\u4f1a\u628a\u9884\u5b9a\u4e49\u597d\u7684\u53d8\u91cf\u590d\u5236\u5230\u4e00\u4e2a\u540d\u5b57\u66f4\u7b80\u77ed\u7684\u53d8\u91cf\u4e2d\uff0c\u5176\u5b9e\u8fd9\u6837\u505a\u7684\u7ed3\u679c\u662f\u589e\u52a0\u4e86\u4e00\u500d\u7684\u5185\u5b58\u6d88\u8017\uff0c\u53ea\u4f1a\u4f7f\u7a0b\u5e8f\u66f4\u52a0\u6162\u3002\u8bd5\u60f3\u4e00\u4e0b\uff0c\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\r\n\u4e2d\uff0c\u5982\u679c\u7528\u6237\u6076\u610f\u63d2\u5165 512KB \u5b57\u8282\u7684\u6587\u5b57\u5230\u6587\u672c\u8f93\u5165\u6846\u4e2d\uff0c\u8fd9\u6837\u5c31\u4f1a\u5bfc\u81f4 1MB \u7684\u5185\u5b58\u88ab\u6d88\u8017\uff01<br\/>BAD:<br\/>$description = $_POST[&#39;description&#39;];<br\/>echo $description;<br\/>GOOD:<br\/>echo $_POST[&#39;description&#39;];<br\/> <\/p><p>41 \u4f7f\u7528\u9009\u62e9\u5206\u652f\u8bed\u53e5<\/p><p>&nbsp; &nbsp; &nbsp;switch case\u597d\u4e8e\u4f7f\u7528\u591a\u4e2aif\uff0celse if\u8bed\u53e5,\u5e76\u4e14\u4ee3\u7801\u66f4\u52a0\u5bb9\u6613\u9605\u8bfb\u548c\u7ef4\u62a4\u3002<\/p><p>42.\u5728\u53ef\u4ee5\u7528file_get_contents\u66ff\u4ee3file\u3001fopen\u3001feof\u3001fgets<\/p><p>&nbsp; &nbsp; \r\n\u5728\u53ef\u4ee5\u7528file_get_contents\u66ff\u4ee3file\u3001fopen\u3001feof\u3001fgets\u7b49\u7cfb\u5217\u65b9\u6cd5\u7684\u60c5\u51b5\u4e0b\uff0c\u5c3d\u91cf\u7528 \r\nfile_get_contents\uff0c\u56e0\u4e3a\u4ed6\u7684\u6548\u7387\u9ad8\u5f97\u591a\uff01\u4f46\u662f\u8981\u6ce8\u610ffile_get_contents\u5728\u6253\u5f00\u4e00\u4e2aURL\u6587\u4ef6\u65f6\u5019\u7684PHP\u7248\u672c\u95ee\u9898\uff1b<\/p><p>43.\u5c3d\u91cf\u7684\u5c11\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c\uff0c\u867d\u7136PHP\u7684\u6587\u4ef6\u64cd\u4f5c\u6548\u7387\u4e5f\u4e0d\u4f4e\u7684\uff1b<\/p><p>44.\u4f18\u5316Select SQL\u8bed\u53e5\uff0c\u5728\u53ef\u80fd\u7684\u60c5\u51b5\u4e0b\u5c3d\u91cf\u5c11\u7684\u8fdb\u884cInsert\u3001Update\u64cd\u4f5c(\u5728update\u4e0a\uff0c\u6211\u88ab\u6076\u6279\u8fc7)\uff1b<\/p><p>45.\u5c3d\u53ef\u80fd\u7684\u4f7f\u7528PHP\u5185\u90e8\u51fd\u6570<\/p><p>46.\u5faa\u73af\u5185\u90e8\u4e0d\u8981\u58f0\u660e\u53d8\u91cf\uff0c\u5c24\u5176\u662f\u5927\u53d8\u91cf\uff1a\u5bf9\u8c61<\/p><p>&nbsp; &nbsp;(\u8fd9\u597d\u50cf\u4e0d\u53ea\u662fPHP\u91cc\u9762\u8981\u6ce8\u610f\u7684\u95ee\u9898\u5427\uff1f)\uff1b<\/p><p>47.\u591a\u7ef4\u6570\u7ec4\u5c3d\u91cf\u4e0d\u8981\u5faa\u73af\u5d4c\u5957\u8d4b\u503c\uff1b<\/p><p>48.foreach\u6548\u7387\u66f4\u9ad8\uff0c\u5c3d\u91cf\u7528foreach\u4ee3\u66ffwhile\u548cfor\u5faa\u73af\uff1b<\/p><p>49.\u201c\u7528i+=1\u4ee3\u66ffi=i+1\u3002\u7b26\u5408c\/c++\u7684\u4e60\u60ef\uff0c\u6548\u7387\u8fd8\u9ad8\u201d\uff1b<\/p><p>50.\u5bf9global\u53d8\u91cf\uff0c\u5e94\u8be5\u7528\u5b8c\u5c31unset()\u6389\uff1b<\/p><p>51 \u5e76\u4e0d\u662f\u4e8b\u5fc5\u9762\u5411\u5bf9\u8c61(OOP)\uff0c\u9762\u5411\u5bf9\u8c61\u5f80\u5f80\u5f00\u9500\u5f88\u5927\uff0c\u6bcf\u4e2a\u65b9\u6cd5\u548c\u5bf9\u8c61\u8c03\u7528\u90fd\u4f1a\u6d88\u8017\u5f88\u591a\u5185\u5b58\u3002<\/p><p>52 \u4e0d\u8981\u628a\u65b9\u6cd5\u7ec6\u5206\u5f97\u8fc7\u591a\uff0c\u4ed4\u7ec6\u60f3\u60f3\u4f60\u771f\u6b63\u6253\u7b97\u91cd\u7528\u7684\u662f\u54ea\u4e9b\u4ee3\u7801\uff1f<\/p><p>53 \u5982\u679c\u5728\u4ee3\u7801\u4e2d\u5b58\u5728\u5927\u91cf\u8017\u65f6\u7684\u51fd\u6570\uff0c\u4f60\u53ef\u4ee5\u8003\u8651\u7528C\u6269\u5c55\u7684\u65b9\u5f0f\u5b9e\u73b0\u5b83\u4eec\u3002<\/p><p>54\u3001\u6253\u5f00apache\u7684mod_deflate\u6a21\u5757\uff0c\u53ef\u4ee5\u63d0\u9ad8\u7f51\u9875\u7684\u6d4f\u89c8\u901f\u5ea6\u3002<\/p><p>&nbsp; &nbsp;\uff08\u63d0\u5230\u8fc7echo \u5927\u53d8\u91cf\u7684\u95ee\u9898\uff09<\/p><p>55\u3001\u6570\u636e\u5e93\u8fde\u63a5\u5f53\u4f7f\u7528\u5b8c\u6bd5\u65f6\u5e94\u5173\u6389\uff0c\u4e0d\u8981\u7528\u957f\u8fde\u63a5\u3002<\/p><p>56\u3001split\u6bd4exploade\u5feb<\/p><p>split()<br\/>0.001813 - 0.002271 seconds (avg 0.002042 seconds)<br\/>explode()<br\/>0.001678 - 0.003626 seconds (avg 0.002652 seconds)<br\/>Split can take regular expressions as delimiters, and runs faster too. ~23% on average.<\/p><p><br\/><\/p>"}