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)

Parameters	Description
string	Required. Specifies the string to check.
charlist	Optional. Specifies which characters are removed from the string. If this parameter is omitted, all of the following characters are removed: "\0" - NULL "\t" - Tab "\n" - Newline "\x0B" - vertical tab "\r" - carriage return " " - space

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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