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. Function syntax: [method_exists(mixed $object,string $method_name)], if the method has been defined in the object class, it returns TRUE.

method_exists() checks whether the method of the class exists. 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.

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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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