php手机号正则替换中间四位

php手机号正则替换中间四位代码如下：

$str = '13525462555';
$pattern = '/(\d{3})(\d{4})(\d{4})/i';
$replacement = '$1****$3';
$resstr = preg_replace($pattern, $replacement,$str);
echo $resstr

效果如下：

183****3322