PHP面试题:单例模式,创建mysqli数据库链接的单例对象
【摘要】
class Db { private static $instance; public $handle; Private function __construct($host,$username,$password,$dbname) { $this->handle=NULL; $this->getcon($ho...
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class Db {
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private static $instance;
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public $handle;
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Private function __construct($host,$username,$password,$dbname) {
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$this->handle=NULL;
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$this->getcon($host,$username,$password,$dbname);
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}
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public static function getBb() {
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self::$instance=new Db();
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return self::$instance;
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}
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private function getcon($host,$username,$password,$dbname) {
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if($this->handle!=NULL){
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return true;
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}
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$this->handle=mysqli_connect($host,$username,$password,$dbname);
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}
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}
文章来源: laoshifu.blog.csdn.net,作者:红目香薰,版权归原作者所有,如需转载,请联系作者。
原文链接:laoshifu.blog.csdn.net/article/details/115221870
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