How to remove trailing comma in php

In php, you can use the rtrim() function to remove the comma at the end of the string. This function can remove the blank characters or other predefined characters on the right side of the string and return the modified string; specific use The syntax "rtrim(string,",")" is to pass the string that needs to remove the trailing comma into the string parameter.

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

php removes the comma at the end of the string

<?php
    $str = "a,b,c,d,";
    echo rtrim($str, ",");
?>

Output:

a,b,c,d

Related function introduction:

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

rtrim(string,charlist)

##ParameterDescriptionRequired. Specifies the string to check. Optional. Specifies which characters are removed from the string. If this parameter is omitted, all of the following characters are removed:

string
charlist	"\0" - NULL "\t" - Tab "\n" - Newline "\x0B" - vertical tab "\r" - carriage return " " - space

Return value: Return the modified string.

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