PHP 手冊
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# method_exists

(PHP 4 , PHP 5)

method_exists -- Checks if the class method exists

## Description

bool method_exists ( object object, string method_name )

This function returns `TRUE` if the method given by method_name has been defined for the given object, `FALSE` otherwise.

範例 1. method_exists() example

`<?php $directory = new Directory('.'); var_dump(method_exists($directory,'read')); ?>`

The above example will output:

    bool(true)

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