PHP Array Exercises : Remove all white spaces in an array

Last update on May 30 2025 13:13:51 (UTC/GMT +8 hours)

54. Remove All White Spaces in Array

Write a PHP script to remove all white spaces in an array.

Sample Solution:

PHP Code:

<?php
// Original array with various values including null, empty strings, and whitespace
$my_array = array(15, null, "  ", -2, NULL, "", " \n", "Red", 54, "\t");

// Print the original array
print_r($my_array);

// Use array_filter with a custom callback function to create a new array filtering out values that are considered empty
$result = array_filter($my_array, create_function('$x', 'return preg_match("#\S#", $x);'));

// Print the new array with non-empty values
print_r($result);

?>

Output:

Array                                                       
(                                                           
    [0] => 15                                               
    [1] =>                                                  
    [2] =>                                                  
    [3] => -2                                               
    [4] =>                                                  
    [5] =>                                                  
    [6] =>                                                  
                                                            
    [7] => Red                                              
    [8] => 54                                               
    [9] =>                                                  
)                                                           
Array                                                       
(                                                           
    [0] => 15                                               
    [3] => -2                                               
    [7] => Red                                              
    [8] => 54                                               
)

Flowchart:

For more Practice: Solve these Related Problems:

• Write a PHP script to iterate over an array of strings and remove all white spaces from each element.
• Write a PHP function to use str_replace() on each element of an array to eliminate white spaces and return the cleaned array.
• Write a PHP program to apply a callback with array_map that trims and removes inner spaces from each string in an array.
• Write a PHP script to process an array of sentences and output each sentence without any spaces.

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