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用str_replace轮换数组时有点怪

WBOY
WBOYOriginal
2016-06-13 12:32:561040browse

用str_replace替换数组时有点怪

$str = '2abc';<br />
$arr1 = array('0', '1', '2', '3', '4', '5', '6');<br />
$arr2 = array('9', '8', '7', '6', '5', '4', '3');<br />
$str = str_replace($arr1, $arr2, $str);<br />
echo $str;<br />
//输出结果正常:7abc

$str = '2abc';<br />
$arr1 = array('0', '1', '2', '3', '4', '5', '6', '7');<br />
$arr2 = array('9', '8', '7', '6', '5', '4', '3', 'W');<br />
$str = str_replace($arr1, $arr2, $str);<br />
echo $str;<br />
//输出结果有误:Wabc

请问为什么会这样啊?
谢谢!

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