PHP Array Exercises : Trim all the elements in an array using array_walk function

Last update on May 30 2025 13:14:46 (UTC/GMT +8 hours)

35. Trim All Array Elements Using array_walk

Write a PHP script to trim all the elements in an array using array_walk function.

Sample Solution:

PHP Code:

<?php
// Define an array with string values containing extra whitespaces
$colors = array( "Red ", " Green", "Black ", " White "); 

// Display the original array using print_r
print_r($colors);

// Use array_walk and create_function to trim whitespaces from each array element
array_walk($colors, create_function('&$val', '$val = trim($val);')); 

// Display the modified array after trimming whitespaces
print_r($colors);
?>

Output:

Array                                                       
(                                                           
    [0] => Red                                              
    [1] =>  Green                                           
    [2] => Black                                            
    [3] =>  White                                           
)                                                           
Array                                                       
(                                                           
    [0] => Red                                              
    [1] => Green                                            
    [2] => Black                                            
    [3] => White                                            
)

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to trim leading and trailing white spaces from all elements in an array using array_walk and a callback function.
Write a PHP function to normalize an array of strings by trimming and converting them to lowercase using array_walk.
Write a PHP program to demonstrate the use of array_walk() to clean up an array with extra spaces and then print the result.
Write a PHP script to iterate through an array of messy strings, trim each element, and display the cleaned results.

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PHP Code Editor:

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