PHP开发小技巧---隐藏手机号中间四位

php隐藏手机号中间四位的方法：
 

$num = "12345678910"

$str = substr_replace($num,'****',3,4);

三种实现方式
 

$tel = '12345678910';

//1.字符串截取法

$new_tel1 = substr($tel, 0, 3).'****'.substr($tel, 7);

var_dump($new_tel1);

//2.替换字符串的子串

$new_tel2 = substr_replace($tel, '****', 3, 4);

var_dump($new_tel2);

//3.用正则

$new_tel3 = preg_replace('/(\d{3})\d{4}(\d{4})/', '$1****$2', $tel);

var_dump($new_tel3);

?>

结果：
 

> string(11) "123****8910"

> string(11) "123****8910"

> string(11) "123****8910"