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PHP rtrim() Function

Last Updated : 21 Jun, 2023
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The rtrim() function is a built-in function in PHP which removes whitespaces or other characters (if specified) from the right side of a string.


rtrim( $string, $charlist )

Parameters: The function rtrim() accepts two parameters as shown in the above syntax. Out of these two parameters, one is mandatory while the other one is optional. They are discussed in details below :

  • $string: This mandatory parameter specifies the string to be checked.
  • $charlist: This optional parameter specifies which characters are to be removed from the string.In case, this parameter is not provided, the following characters are removed :
    • “\0” – NULL
    • “\t” – tab
    • “\n” – new line
    • “\x0B” – vertical tab
    • “\r” – carriage return
    • ” “ – ordinary white space

Return Value: Returns the modified string.


Input : $string = "Geeks for Geeks    "
Output : Geeks for Geeks

Input : $string = "Geeks for !!! (( !!))", $charlist = "! ()"
Output : Geeks for 

Below programs will illustrate rtrim() function :

Program 1: This program shows the use of rtrim() function without any specified list of characters to be removed.

$string = "Geeks for    ";
echo rtrim($string)." Geeks";


Geeks for Geeks

Program 2: This program shows the use of rtrim() function with a specified list of characters to be removed.

$string = "Geeks for !!! (( !!))";
// The characters '!', '(', ')', ' ' have been specified 
// to remove from the end of the string
echo rtrim($string, "! ()")." Geeks";


Geeks for Geeks


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