//验证手机号
$match = '/^((13[0-9])|(15[^4,\\d])|(18[0,5-9]))[0-9]{8}$/';
//验证座机
$match = '/^(0[0-9]{2,3}\-)?([2-9][0-9]{6,7})+(\-[0-9]{1,4})?$/';
//验证身份证号15或18位
$match = '/(^\d{15}$)|(^\d{17}(\d|X|x)$)/';
//Email验证
$match = '/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/';
//将手机号中间转换为 * 号
$tel = 18612345678;
$pattern = '/(\d{3})\d{4}(\d{3})/';
$replacement = "\$1****\$2";
echo preg_replace($pattern,$replacement,$tel);