How to determine whether a class method exists in php

php method to determine whether a class method exists: You can use the method_exists() function to determine. The specific usage method is: [method_exists($directory,'read')]. The method_exists() function checks whether a class method exists in the specified object.

Function definition:

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method_exists( ) function checks whether a class method exists in the specified object. If the method pointed to by method_name has been defined in the object class pointed to by object, then TRUE is returned, otherwise FALSE is returned.

Function syntax:

bool method_exists ( mixed $object , string $method_name )

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Code implementation:

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

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