PHP rtrim() Function: Description, Parameters, Return Value, and Usage Examples
This article explains PHP's rtrim() function, detailing its syntax, parameters, default characters removed, and provides multiple code examples demonstrating how to trim whitespace, custom character masks, and ASCII control characters from the end of strings.
The article introduces PHP's rtrim() function, which removes whitespace or specified characters from the end of a string.
Syntax: string rtrim(string $str [, string $character_mask])
Parameters: • $str : The input string. • $character_mask (optional): A list of characters to strip; ranges can be specified with .. .
Return value: The function returns the trimmed string. Without a mask, it removes the following characters: space (0x20), tab (0x09), newline (0x0A), carriage return (0x0D), NUL (0x00), and vertical tab (0x0B).
Example usage:
Output of the example:
string(32) " These are a few words :) ... "
string(16) " Example string\n"
string(11) "Hello World"
string(30) " These are a few words :) ..."
string(26) " These are a few words :)"
string(9) "Hello Wor"
string(15) " Example string"An additional example shows how to strip all ASCII control characters from a binary string using a mask like "\x00..\x1F" , demonstrating the flexibility of rtrim() for custom trimming needs.
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