<?php
$mobile = "15810320826";
echo substr_replace($mobile,'****',3 , 4); //將手機號中間4位隱藏爲*號,結果爲158****0826
?>
<?php
$time=1591457255;
echo substr_replace($time,"#",4,1); //將時間戳第4位替換爲#,結果爲159#457255
?>
<?php
$mobile = "15810320826";
echo substr_replace($mobile,'****',3 , 4); //將手機號中間4位隱藏爲*號,結果爲158****0826
?>
<?php
$time=1591457255;
echo substr_replace($time,"#",4,1); //將時間戳第4位替換爲#,結果爲159#457255
?>