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This article mainly shows you "php how to determine whether the specified method is defined in the class", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "php how to determine whether the specified method is defined in the class" this article.

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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