How to remove the last comma from a string in php

php method to remove the last comma from a string: 1. Create a PHP sample file; 2. Define a string with a comma; 3. Through "rtrim($str, ',');" This method removes the last comma from the string. The rtrim() function is used to remove blank characters or other predefined characters on the right side of a string. The syntax is "rtrim(string,charlist)". The parameter "charlist" specifies the characters to be deleted from the string.

#The operating environment of this article: Windows 7 system, PHP8, Dell G3 computer.

The PHP character filter function removes the last comma from the string. It is easier to solve it with the rtrim function that comes with PHP.

First explain it separately,

trim过滤字符串两端,
rtrim过滤字符串尾部
ltrim过滤字符串首部.

You can only use str_replace to filter the keys in the string.

For example,

PHP code

The code is as follows:

$str = '123,333,234,';
echo rtrim($str, ',');

PHP rtrim

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

Syntax:

rtrim(string,charlist)

Parameters	Description
string	Required. Specifies the string to check.
charlist	Optional. Specifies which characters are removed from a string. If omitted, all the following characters are removed: "\0" - NULL "\t" - TAB "\n" - Line feed "\x0B" - vertical tab character "\r" - carriage return " " - space

Return value: Return the modified string.

Example: Remove spaces on the right side of the string

<?php
header("Content-type:text/html;charset=utf-8");
$str = "Hello World    ";
echo "不使用 rtrim：" . $str."!";
echo "<br>";
echo "使用 rtrim：" . rtrim($str)."!";
?>

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