{"id":159,"title":"php\u53d8\u91cf","good":0,"bad":0,"hit":1890,"created_at":"2016-01-14 23:23:42","content":"

PHP \u4e2d\u7684\u53d8\u91cf\u7528\u4e00\u4e2a\u7f8e\u5143\u7b26\u53f7\u540e\u9762\u8ddf\u53d8\u91cf\u540d\u6765\u8868\u793a\u3002\u53d8\u91cf\u540d\u662f\u533a\u5206\u5927\u5c0f\u5199\u7684\u3002<\/p>

\u53d8\u91cf\u540d\u4e0e PHP     \u4e2d\u5176\u5b83\u7684\u6807\u7b7e\u4e00\u6837\u9075\u5faa\u76f8\u540c\u7684\u89c4\u5219\u3002\u4e00\u4e2a\u6709\u6548\u7684\u53d8\u91cf\u540d\u7531\u5b57\u6bcd\u6216\u8005\u4e0b\u5212\u7ebf\u5f00\u5934\uff0c\u540e\u9762\u8ddf\u4e0a\u4efb\u610f\u6570\u91cf\u7684\u5b57\u6bcd\uff0c\u6570\u5b57\uff0c\u6216\u8005\u4e0b\u5212\u7ebf\u3002\u6309\u7167\u6b63\u5e38\u7684\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u5b83\u5c06\u88ab\u8868\u8ff0\u4e3a\uff1a'[a-zA-Z_x7f-xff][a-zA-Z0-9_x7f-xff]*'\u3002<\/p>

Note:      \u5728\u6b64\u6240\u8bf4\u7684\u5b57\u6bcd\u662f a-z\uff0cA-Z\uff0c\u4ee5\u53ca ASCII \u5b57\u7b26\u4ece 127 \u5230 255\uff080x7f-0xff\uff09\u3002         <\/p>

Note:      $this \u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u53d8\u91cf\uff0c\u5b83\u4e0d\u80fd\u88ab\u8d4b\u503c\u3002<\/p>

<\/p>

\u4f7f\u7528\u5f15\u7528\u8d4b\u503c\uff0c\u7b80\u5355\u5730\u5c06\u4e00\u4e2a &    \u7b26\u53f7\u52a0\u5230\u5c06\u8981\u8d4b\u503c\u7684\u53d8\u91cf\u524d\uff08\u6e90\u53d8\u91cf\uff09\u3002\u4f8b\u5982\uff0c\u4e0b\u5217\u4ee3\u7801\u7247\u65ad\u5c06\u8f93\u51fa"My name is Bob"\u4e24\u6b21\uff1a<\/p>

<?php$foo = 'Bob';              \/\/ \u5c06 'Bob' \u8d4b\u7ed9 $foo$bar = &$foo;              \/\/ \u901a\u8fc7 $bar \u5f15\u7528 $foo$bar = "My name is $bar";  \/\/ \u4fee\u6539 $bar \u53d8\u91cfecho $bar;echo $foo;                 \/\/ $foo \u7684\u503c\u4e5f\u88ab\u4fee\u6539?><\/p>

<\/p>

\u53d8\u91cf\u8303\u56f4<\/p>

\u53d8\u91cf\u7684\u8303\u56f4\u5373\u5b83\u5b9a\u4e49\u7684\u4e0a\u4e0b\u6587\u80cc\u666f\uff08\u4e5f\u5c31\u662f\u5b83\u7684\u751f\u6548\u8303\u56f4\uff09\u3002\u5927\u90e8\u5206\u7684     PHP \u53d8\u91cf\u53ea\u6709\u4e00\u4e2a\u5355\u72ec\u7684\u8303\u56f4\u3002\u8fd9\u4e2a\u5355\u72ec\u7684\u8303\u56f4\u8de8\u5ea6\u540c\u6837\u5305\u542b\u4e86     include \u548c require \u5f15\u5165\u7684\u6587\u4ef6\u3002\u4f8b\u5982\uff1a<\/p>

<?php$a = 1;include 'b.inc';?><\/p>

Example #1 \u4f7f\u7528 global<\/p>

<?php$a = 1;$b = 2;function Sum(){    global $a, $b;    $b = $a + $b;}Sum();echo $b;?><\/p>

\u4ee5\u4e0a\u811a\u672c\u7684\u8f93\u51fa\u5c06\u662f"3"\u3002\u5728\u51fd\u6570\u4e2d\u58f0\u660e\u4e86\u5168\u5c40\u53d8\u91cf$a\u548c$b\t\u4e4b\u540e\uff0c\u5bf9\u4efb\u4e00\u53d8\u91cf\u7684\u6240\u6709\u5f15\u7528\u90fd\u4f1a\u6307\u5411\u5176\u5168\u5c40\u7248\u672c\u3002\u5bf9\u4e8e\u4e00\u4e2a\u51fd\u6570\u80fd\u591f\u58f0\u660e\u7684\u5168\u5c40\u53d8\u91cf\u7684\u6700\u5927\u4e2a\u6570\uff0cPHP \u6ca1\u6709\u9650\u5236\u3002<\/p>

\u5728\u5168\u5c40\u8303\u56f4\u5185\u8bbf\u95ee\u53d8\u91cf\u7684\u7b2c\u4e8c\u4e2a\u529e\u6cd5\uff0c\u662f\u7528\u7279\u6b8a\u7684 PHP \u81ea\u5b9a\u4e49$GLOBALS\u6570\u7ec4\u3002\u524d\u9762\u7684\u4f8b\u5b50\u53ef\u4ee5\u5199\u6210\uff1a<\/p>

Example #2 \u4f7f\u7528$GLOBALS\u66ff\u4ee3 global<\/p>

<?php$a = 1;$b = 2;function Sum(){    $GLOBALS['b'] = $GLOBALS['a'] + $GLOBALS['b'];}Sum();echo $b;?><\/p>

<?phpfunction test(){    static $a = 0;    echo $a;    $a++;}?><\/p>

\u73b0\u5728\uff0c\u53d8\u91cf$a\u4ec5\u5728\u7b2c\u4e00\u6b21\u8c03\u7528 test() \u51fd\u6570\u65f6\u88ab\u521d\u59cb\u5316\uff0c\u4e4b\u540e\u6bcf\u6b21\u8c03\u7528 test() \u51fd\u6570\u90fd\u4f1a\u8f93\u51fa$a\u7684\u503c\u5e76\u52a0\u4e00\u3002<\/p>

<\/p>

\u53ef\u53d8\u53d8\u91cf<\/p>

\u6709\u65f6\u5019\u4f7f\u7528\u53ef\u53d8\u53d8\u91cf\u540d\u662f\u5f88\u65b9\u4fbf\u7684\u3002\u5c31\u662f\u8bf4\uff0c\u4e00\u4e2a\u53d8\u91cf\u7684\u53d8\u91cf\u540d\u53ef\u4ee5\u52a8\u6001\u7684\u8bbe\u7f6e\u548c\u4f7f\u7528\u3002\u4e00\u4e2a\u666e\u901a\u7684\u53d8\u91cf\u901a\u8fc7\u58f0\u660e\u6765\u8bbe\u7f6e\uff0c\u4f8b\u5982\uff1a<\/p>

<?php$a = 'hello';?><\/p>

\u4e00\u4e2a\u53ef\u53d8\u53d8\u91cf\u83b7\u53d6\u4e86\u4e00\u4e2a\u666e\u901a\u53d8\u91cf\u7684\u503c\u4f5c\u4e3a\u8fd9\u4e2a\u53ef\u53d8\u53d8\u91cf\u7684\u53d8\u91cf\u540d\u3002\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d     hello \u4f7f\u7528\u4e86\u4e24\u4e2a\u7f8e\u5143\u7b26\u53f7\uff08$\uff09\u4ee5\u540e\uff0c\u5c31\u53ef\u4ee5\u4f5c\u4e3a\u4e00\u4e2a\u53ef\u53d8\u53d8\u91cf\u7684\u53d8\u91cf\u4e86\u3002\u4f8b\u5982\uff1a<\/p>

<?php$$a = 'world';?><\/p>

\u8fd9\u65f6\uff0c\u4e24\u4e2a\u53d8\u91cf\u90fd\u88ab\u5b9a\u4e49\u4e86\uff1a$a\u7684\u5185\u5bb9\u662f"hello"\u5e76\u4e14$hello\u7684\u5185\u5bb9\u662f"world"\u3002\u56e0\u6b64\uff0c\u4ee5\u4e0b\u8bed\u53e5\uff1a<\/p>

<?phpecho "$a ${$a}";?><\/p>

\u4e0e\u4ee5\u4e0b\u8bed\u53e5\u8f93\u51fa\u5b8c\u5168\u76f8\u540c\u7684\u7ed3\u679c\uff1a<\/p>

<?phpecho "$a $hello";?><\/p>

<\/p>"}