PHP trim() Function

The PHP trim() function returns a string which is trimmed version of the specified string. It removes whitespaces or other characters from both sides of the string.

Syntax

trim(string, characters)

Parameters

`string`	`Required.` Specify the string to trim.
`Characters`	`Optional.` Specify characters which need to be trimmed from the string. Without this parameter, the function will strip following characters: " " - an ordinary space. "\t" - a tab. "\n" - a new line (line feed). "\r" - a carriage return. "\0" - the NULL-byte. "\v" - a vertical tab.

Return Value

Returns the trimmed version of the specified string.

Example:

In the example below, trim() function is used to trim the given string.

<?php
$MyString = "    Hello World!.    ";
$NewString = trim($MyString);

echo $NewString."\n";
?>

The output of the above code will be:

Hello World!.

Example:

We can also specify the characters which need to be trimmed from the string as shown in the example below.

<?php
$MyString = ",*#Hello World!#@!";
$NewString = trim($MyString, ",*#@!");

echo $NewString."\n";
?>

The output of the above code will be:

Hello World

Example: Trimming array values

Consider one more example where this function is used to trim the array values.

<?php
function trim_value(&$value) { 
  $value = trim($value, "# @*"); 
}

$arr = array("#John", " Marry ", " Kim*", "@Jo");
print_r($arr);

echo "\n";

//trimming the array values 
array_walk($arr, 'trim_value');
print_r($arr);
?>

The output of the above code will be:

Array
(
    [0] => #John
    [1] =>  Marry 
    [2] =>  Kim*
    [3] => @Jo
)

Array
(
    [0] => John
    [1] => Marry
    [2] => Kim
    [3] => Jo
)

❮ PHP String Reference