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URL title: PHP如何判断函数/类/属性/方法是否存在 | Hello 前端俱乐部
URL description: php判断函数是否存在bool function_exists($funcName){}1function_exists('myFuncName');php判断类是否存在
URL keywords: php, 判断函数/类/属性/方法是否存在
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