How to replace the last two characters of a string with other characters in php

In PHP, you can use the substr_replace() function to replace the last two characters of a string with other characters. This function can start from the specified position in the string and replace the specified number of characters with the specified value; you only need to set the second parameter of the function to the specified replacement value, the third parameter to "-2", and the fourth parameter to Just set it to 2 or omit it, the syntax is "substr_replace(string,"replacement value",-2,2)" or "substr_replace(string,"replacement value",-2)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In php, you can use the substr_replace() function Replace the last two characters of the string with other characters.

The substr_replace() function can replace a substring of a specified length (a specified number of characters) with a specified value starting from the specified position in the string.

substr_replace(string,replacement,start,length)

Parameters	Description
string	Required . Specifies the string to check.
replacement	Required. Specifies the string to be inserted.
start	Required. Specifies where in the string to begin replacement. Positive number - starts at the specified position in the string Negative number - starts at the specified position from the end of the string 0 - at the first character in the string Start at
length	Optional. Specifies how many characters to replace. The default is the same as the string length. Positive number - the length of the string to be replaced Negative number - the number of characters to be replaced from the end of the string 0 - insert instead of replace

You only need to set the second parameter of the substr_replace() function to the specified replacement value, the third parameter to "-2", and the fourth parameter to 2 or omit it to replace the last two characters of the string with other characters.

Example: Replace the last two digits of the string "hello123" with "**"

<?php
header("Content-type:text/html;charset=utf-8");
$str="hello123";
echo "原字符串：";
var_dump($str);
echo "将字符串后两位替换为**：";
$newStr1=substr_replace($str,"**",-2,2);
var_dump($newStr1);
$newStr2=substr_replace($str,"**",-2);
var_dump($newStr2);
?>

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