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PHP Array Exercises : Remove all white spaces in an array

PHP Array: Exercise-54 with Solution

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

Sample Solution:

PHP Code:

<?php
 $my_array = array(15, null, "  ", -2, NULL, "", " \n", "Red", 54, "\t");
print_r($my_array);
$result = array_filter($my_array, create_function('$x','return preg_match("#\S#", $x);'));                 
print_r($result);
?>

Sample 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:

Flowchart: PHP - Remove all white space in an array

PHP Code Editor:

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Previous: Write a PHP script to delete a specific value from an array using array_filter() function.
Next: Write a PHP function to convert a string to an array (trimming every line and remove empty lines).

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC