How to remove a character in php rtrim()

In PHP, the rtrim() function can remove blank characters or other predefined characters on the right side of a string. Just set the "rtrim (string to be checked, character to be deleted)" statement. Removes a specified character from a string.

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

php rtrim removes one character

<?php
header("Content-type:text/html;charset=utf-8");
$str = "Hello World!";
echo &#39;原字符串：&#39;.$str . "<br>";
echo &#39;删除字符串右侧的一个字符！后：&#39;.rtrim($str,"!");
?>

Output:

原字符串：Hello World!
删除字符串右侧的一个字符！后：Hello World

Description:

rtrim() function removes whitespace characters on the right side of the string or other predefined characters.

Syntax

rtrim(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.

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