PHP手机号中间位数隐藏保密星号*代替

方法一、字符串截取法，就是substr截取前三位，中间拼接四个*符号，后边再拼接上substr截取的后四位，示例：

<?php
$mobile = '13123456789';
$newMobile = substr($mobile, 0, 3).'****'.substr($mobile, -4);
echo $newMobile;
?>

<?php
<?php
$mobile = '13123456789';
$newMobile = substr_replace($mobile, '****', 3, 4);
echo $newMobile;
?>

<?php
$mobile = '13123456789';
$newMobile = preg_replace('/(\d{3})\d{4}(\d{4})/', '$1****$2', $mobile);
echo $newMobile;
?>

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