How to remove the last three digits from a string in php

Two removal methods: 1. Use the substr_replace() function to replace the last 3 characters of the string with the empty character "''". The syntax is "substr_replace(string,"",-3,3 )" or "substr_replace(string,"",-3)". 2. Use the substr() function to intercept all characters except the last 3 characters from the head of the string. The syntax is "substr(string,0,-3)".

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

In php, you can use the following two functions Remove the last three digits of the string. Remove the last three digits of the string.

• substr_replace() function

• substr() function
  

Method 1: Use the substr_replace() function to remove

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

substr_replace(string,replacement,start,length)

You only need to set the second parameter of the substr_replace() function to the empty string '', and set the third parameter to "-3", the fourth parameter is set to 3 or omitted to delete the last 3 digits of the string.

Example: Delete the last 3 digits of the string "hello123"

<?php
header("Content-type:text/html;charset=utf-8");
$str="hello123";
echo "原字符串：";
var_dump($str);
echo "去除字符串后三位：";
$newStr1=substr_replace($str,&#39;&#39;,-3,3);
var_dump($newStr1);
$newStr2=substr_replace($str,&#39;&#39;,-3);
var_dump($newStr2);
?>

Method 2: Use substr() Function remove

substr() function can intercept a certain length of characters from the specified position of the string and return it. This intercepted character can be called a "substring" or "subcharacter String”

substr(string,start,length)

Just use the substr() function to intercept all characters except the last 3 characters from the beginning of the string:

• That is, set the second parameter of the function to 0, the third parameter is set to -3 to delete the last 3 characters.

Example: Delete the last 3 digits of the string "hello123"

<?php
header("Content-type:text/html;charset=utf-8");
$str="hello123";
echo "原字符串：";
var_dump($str);
echo "去除字符串后三位：";
$newstr=substr($str,0,-3);
var_dump($newstr);
?>

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