PHP输入过滤utf-8

<?php
header("Content-Type:text/html;charset=utf-8");
$string = "April<15, =&:.2003_哈市的发了sd卡房间";
$pattern = "/[^\x{4e00}-\x{9fa5}a-zA-Z0-9_]+/u";
$replacement = "";
print preg_replace($pattern, $replacement, $string);


// April152003_哈市的发了sd卡房间











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