{"id":368,"title":"php\u8bbe\u8ba1\u6a21\u5f0f-\u5355\u4f8b\u6a21\u5f0f","good":0,"bad":0,"hit":2321,"created_at":"2018-07-17 00:16:31","content":"<pre class=\"brush:php;toolbar:false\">&lt;?php\n\n\/**\n&nbsp;*&nbsp;\u8bbe\u8ba1\u6a21\u5f0f-\u5355\u4f8b\u6a21\u5f0f\n&nbsp;*\/\nclass&nbsp;mysql\n{\n&nbsp;&nbsp;&nbsp;&nbsp;private&nbsp;static&nbsp;$instance;\n&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;$name;\n\n&nbsp;&nbsp;&nbsp;&nbsp;\/\/final&nbsp;\u9632\u6b62\u7ee7\u627f\u65f6\u8986\u76d6\n&nbsp;&nbsp;&nbsp;&nbsp;final&nbsp;private&nbsp;function&nbsp;__construct()\n&nbsp;&nbsp;&nbsp;&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/\u7981\u6b62new()\u4e00\u4e2amysql\u5bf9\u8c61\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;&#39;\u53ef\u4ee5\u5728\u8fd9\u91cc\u521b\u5efa\u6570\u636e\u5e93\u8fde\u63a5&#39;;\n&nbsp;&nbsp;&nbsp;&nbsp;}\n\n&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;static&nbsp;function&nbsp;getInstance()\n&nbsp;&nbsp;&nbsp;&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\/\/\u591a\u6b21\u5b9e\u4f8b\u5316\u65f6\u53ea\u6267\u884c\u4e00\u6b21new()\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(!isset(self::$instance))&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self::$instance&nbsp;=&nbsp;new&nbsp;self();\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}\n\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;self::$instance;\n&nbsp;&nbsp;&nbsp;&nbsp;}\n\n&nbsp;&nbsp;&nbsp;&nbsp;final&nbsp;private&nbsp;function&nbsp;__clone()\n&nbsp;&nbsp;&nbsp;&nbsp;{\n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;&#39;\u4e0d\u5141\u8bb8\u514b\u9686\u5bf9\u8c61&#39;;\n&nbsp;&nbsp;&nbsp;&nbsp;}\n}\n\n\n$mysql1&nbsp;=&nbsp;mysql::getInstance();\n$mysql2&nbsp;=&nbsp;mysql::getInstance();\n$mysql1-&gt;name=&#39;name1&#39;;\n$mysql2-&gt;name=&#39;name2&#39;;\necho&nbsp;&#39;&lt;hr\/&gt;&#39;.$mysql1-&gt;name;\nvar_dump($mysql1&nbsp;===&nbsp;$mysql2);\nvar_dump($mysql2);<\/pre><p><br\/><\/p><p><br\/><\/p><p>\u8fd0\u884c\u7ed3\u679c\uff1a<\/p><p><span style=\"font-family: &quot;Microsoft YaHei&quot;; font-size: medium;\">\u53ef\u4ee5\u5728\u8fd9\u91cc\u521b\u5efa\u6570\u636e\u5e93\u8fde\u63a5<\/span><\/p><hr\/><p><span style=\"font-family: &quot;Microsoft YaHei&quot;; font-size: medium;\">name2<\/span><\/p><pre class=\"xdebug-var-dump\">D:\\phpStudy\\WWW\\design\\1.php:36:boolean&nbsp;true<\/pre><pre class=\"xdebug-var-dump\">D:\\phpStudy\\WWW\\design\\1.php:37:object(mysql)[1]&nbsp;&nbsp;public&nbsp;&#39;name&#39;&nbsp;=&gt;&nbsp;string&nbsp;&#39;name2&#39;&nbsp;(length=5)<\/pre><p><br\/><\/p>"}