How to determine whether methods and attributes exist in php

php method to determine whether methods and attributes exist: [method_exists(mixed $object,string $method_name);property_exists(mixed $class,string $property);].

The operating environment of this article: windows10 system, php 7, thinkpad t480 computer.

php determines whether a method in the class exists:

bool method_exists (mixed $object, string $method_name) Check whether the method of the class exists, for example:

$directory=new Directory; if(!method_exists($directory,'read')){ echo '未定义read方法！'; }

PHP determines whether a property in the class has been defined:

bool property_exists(mixed $class, string $property) Check whether the property of the class exists, for example:

$directory=new Directory; if(!property_exists($directory,'li')){ echo '未定义li属性！'; }

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