Trim whitespace characters from array values in PHP

This article demonstrates how to trim whitespace characters from the array values in PHP. The whitespace is composed of space, tab, line feed, carriage return, form feed, and vertical tab.

1. Using `array_map()` function

The array_map() function applies a callback function to each array element. It returns a new array containing the results of applying the callback to each value in the array. To remove all the leading and trailing whitespace from the array values, you can use the trim() function as a callback to the array_map() function.

<?php

$array = array('a', 'b ', ' c ');

var_export($array);

array (

0 => 'a',

1 => 'b ',

2 => ' c ',

)

$trimmed_array = array_map('trim', $array);

var_export($trimmed_array);

array (

0 => 'a',

1 => 'b',

2 => 'c',

)

Download Run Code

2. Using `array_walk()` function

The above solution applies a callback to all values and returns a new array with the updated values. If you want to in-place modify the array, you can walk through the entire array and apply a user-defined callback function to each encountered element using the array_walk() function.

The callback function accepts the value of the array member as a parameter, optionally followed by the key. However, array_walk() cannot be used to alter the keys of the array, only its values can be changed. The following example demonstrates the usage of array_walk() to trim an array using an anonymous function.

<?php

$array = array('a', 'b ', ' c ');

var_export($array);

array (

0 => 'a',

1 => 'b ',

2 => ' c ',

)

array_walk($array, function (&$value) {

$value = trim($value);

});

var_export($array);

array (

0 => 'a',

1 => 'b',

2 => 'c',

)

Download Run Code

That’s all about trimming whitespace characters from the array values in PHP.

Trim whitespace characters from array values in PHP

1. Using array_map() function

2. Using array_walk() function

1. Using `array_map()` function

2. Using `array_walk()` function