How to determine whether a method in php exists

How to determine whether a method in php exists: You can use the method_exists function to determine, such as [method_exists($directory,'read')]. If you want to determine whether the properties in the class have been defined, you can use the property_exists function to determine.

Related functions:

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

Code example:

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

If you want to determine whether a certain attribute in the class has been defined, use the following method:

bool property_exists ( mixed $class , string $property ) Check whether the properties of the class exist

Code example:

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

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