interface_exists
(PHP 5)
interface_exists -- Checks if the interface has been defined
Description
bool
interface_exists ( string interface_name [, bool autoload] )
This function returns TRUE if the interface given by
interface_name has been defined,
FALSE otherwise.
例子 1. interface_exists() example
<?php
// Check the interface exists before trying to use it
if (interface_exists('MyInterface')) {
class MyClass implements MyInterface
{
// Methods
}
}
?>
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interface_exists() will attempt to call __autoload by
default, if you don't want interface_exists() to
call __autoload, you can set the parameter autoload
to FALSE.
See also class_exists().