How does php determine whether a specified method is defined in a class

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In php, you can use the method_exists () function to determine whether a specified method is defined in a class, which checks whether the specified method of the class exists, the syntax "method_exists ($object,$method_name)"; if defined, returns true, otherwise returns false.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, you can use the method_exists () function to determine whether a specified method is defined in a class.

Example:

$directory=new Directory;if (! method_exists ($directory,'read')) {echo'no read method defined!' ;}

Description:

The method_exists () function checks whether the specified method of the class exists. Syntax:

Method_exists (mixed $object, string $method_name): bool

This function checks whether the method of the class exists in the specified object.

Object: object example or class name.

Method_name: method name.

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