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xiaozi 2014-11-21 22:12:00

php 中，判断数组的键是否存在时，应使用`array_key_exists`而不是`isset`

php php 
<?php

$arr = [
	'iamnull' => null,
];

var_dump(isset($arr['iamnull']));

var_dump(array_key_exists('iamnull', $arr));

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