Description:
------------
---
From manual page: http://www.php.net/function.array-key-exists#refsect1-function.array-key-exists-description
---


array_key_exists function accept two parameters, the first one is "Mixed" which is tell in the documentation, but it gives a warning : 'it must be string or integer'. there should not display any warning even I set the error_reporting is "E_ALL | E_STRICT".

Test script:
---------------
<?php
$key = array('trade_mode', 'trade_state');

$params['trade_mode'] = 1;
$params['trade_state'] = 1;
$params['a'] = 1;
$params['b'] = 1;

if(array_key_exists($key, $params)){
	echo 1;
}else{
	echo 2;
}
exit;

Expected result:
----------------
1

Actual result:
--------------
Warning: array_key_exists() [function.array-key-exists]: The first argument should be either a string or an integer in D:\www\index.php on line 9
2