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
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