How to hide 6-digit ID number in php

Hide method: 1. Use the "substr_replace($str,str_repeat("*",6), -6)" statement to hide the last 6 digits; 2. Use "substr_replace($str,str_repeat( "*",6),6,6)" statement can hide the middle 6 digits.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In PHP, you can use the substr_replace() function and substr_replace() function to hide the ID number and replace the hidden numbers with asterisks.

1. Hide the last 6 digits of the ID number

<?php
header("Content-type:text/html;charset=utf-8");
$str = "371515111111116042";
echo substr_replace($str,str_repeat("*",6),-6);
?>

##2. Hide the middle 6 digits of the ID number

<?php
header("Content-type:text/html;charset=utf-8");
$str = "371515111111116042";
echo substr_replace($str,str_repeat("*",6),6,6);
?>

3. Hide the first 6 digits of the ID number

<?php
header("Content-type:text/html;charset=utf-8");
$str = "371515111111116042";
echo substr_replace($str,str_repeat("*",6),0,6);
?>

Description:

substr_replace() function replaces part of a string with another string; it will replace a string of specified length starting from the specified position.

str_repeat() function repeats a string a specified number of times.

In the above example, the asterisk "*" character is repeated a specified number of times (consistent with the number of digits to be hidden), and the produced substring is used as the replacement value to replace part of the string.

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