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method_exists
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method_exists

Name

method_exists — Tests for the existence of a method within an object.

Synopsis

bool method_exists(obj, method_name); object obj: Object to test for the existence of the given method string method_name: Method name to test for existence in the given object

Returns

TRUE if the method exists in the given object; FALSE if obj is not an object or the method doesn't exist in the object

Description

method_exists() tests for the existence of a given method within a given object. Returns TRUE if the method exists within the object. If the method doesn't exist within the object, or if the obj argument is not an object, returns FALSE.

Version

PHP Version: 4.0b2+

Example

Example 109. Test for the existence of a method within an object

class boolean_switch {
    function boolean_switch ($state = 0) {
        $this->switch = $switch;
    }
    
    function on () {
        $this->switch = 1;
    }
        
    function off () {
        $this->switch = 1;
    }
        
    function flip () {
        $this->switch = ! $this->switch;
    }
    
    function state () {
        return $this->switch;
    }
}

$lamp_switch = new boolean_switch ('.');
$method = 'flip';

$qualifier = method_exists ($lamp_switch, $method) ? 'exists' : 'does not exist';

print "Method <i>$method</i> $qualifier in object <i>\$lamp_switch</i>.";

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PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.