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discuz X的单件模式

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Release: 2016-06-13 11:26:27
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文章介绍了一个关于discuz X的单件模式原创文章,PPC高亮插件太不友好了,我直接贴txt内容都会有奇奇怪怪问题发生。

X的只要文件开头都有这么一句话

 代码如下 复制代码

$discuz = & discuz_core::instance();
[code language=php]

 

// instance()属于discuz_core类在class_core.php
function &instance() {
static $object;
if(empty($object)) {
  $object = new discuz_core();
}
return $object;
}
[/code]
这里保证单词请求都运用一个discuz_core实例。这里的&写法是为了兼容PHP4的,如果在PHP5中,则可以使用static。
[code language=php]
//这里是单件模式的简单例子。
class PHPig {
private static $v = null;
static function instance() {
  if(self::$v == null) {
   self::$v = new PHPig();
  }
  return self::$v;
}
}
$pig1 = PHPig::instance();
$pig2 = PHPig::instance();
if($pig1 === $pig2) {
echo '同一个对象';
} else {
echo '不是同一个对象';
}
[/code]


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