How to remove specified characters on both sides of a string in php

php method to remove specified characters on both sides of a string: 1. Use the trim() function, the syntax is "trim(string,'specified characters')"; 2. Use the ltrim() and rtrim() functions, the syntax "rtrim(ltrim(string,'Specified character on the left'),'Specified character on the right')".

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

php removes strings Specified characters on both sides

1. Use trim() function

Example: Remove commas on both sides of the string

<?php
header("Content-type:text/html;charset=utf-8"); 
$str = &#39;,1,2,5,&#39;;
echo trim($str,&#39;,&#39;);
?>

trim() function removes whitespace characters or other predefined characters on both sides of a string.

Syntax:

trim(string,charlist)

Return value: Return the modified string.

2. Use the ltrim() and rtrim() functions

• ltrim() - Remove the white space on the left side of the string character or other predefined characters.

• rtrim() - Removes whitespace characters or other predefined characters on the right side of the string.

Example:

<?php
header("Content-type:text/html;charset=utf-8"); 
$str = &#39;-欢迎来到PHP中文网！&#39;;
echo rtrim(ltrim($str,&#39;-&#39;),&#39;！&#39;);
?>

Recommended learning: "PHP Video Tutorial"

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