PHP
downloads | documentation | faq | getting help | mailing lists | licenses | wiki | reporting bugs | php.net sites | links | conferences | my php.net

search for in the

is_a> <get_parent_class
Last updated: Sun, 25 Nov 2007

view this page in

interface_exists

(PHP 5 >= 5.0.2)

interface_exists — 检查接口是否已被定义

说明

bool interface_exists ( string $interface_name [, bool $autoload ] )

本函数在由 interface_name 给出的接口已定义时返回 TRUE,否则返回 FALSE

Example#1 interface_exists() 例子

<?php
// Check the interface exists before trying to use it
if (interface_exists('MyInterface')) {
    class 
MyClass implements MyInterface
    
{
        
// Methods
    
}
}
?>

interface_exists() 默认会尝试调用 __autoload,如果不希望 interface_exists() 去调用 __autoload,可以将 autoload 参数设为 FALSE

参见 class_exists()



add a note add a note User Contributed Notes
interface_exists
andrey at php dot net
24-Oct-2004 07:40
As far as I remember interface_exists() was added in 5.0.2 . In 5.0.0 and 5.0.1 class_exists() used to return TRUE when asked for a existing interface. Starting 5.0.2 class_exists() doesn't do that anymore.

is_a> <get_parent_class
Last updated: Sun, 25 Nov 2007
 
 
show source | credits | sitemap | contact | advertising | mirror sites