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PHP Challenges: Push all zeros to the end of an array

PHP Challenges - 1: Exercise-22 with Solution

Write a PHP program to push all zeros to the end of an array.

Input : (0,2,3,4,6,7,10)

Explanation :

PHP: Push all zeros to the end of an array

Sample Solution :

PHP Code :

<?php
function move_zero($arr)
{
   $count = 0;
   $n = sizeof($arr);
    
    for ($i = 0; $i < $n; $i++)
    {
        if ($arr[$i] != 0)
          {
            $arr[$count++] = $arr[$i]; 
          }
     }
 
    // Let all non-zero elements have been shifted towards front  
    
    while ($count < $n)
    {
        $arr[$count++] = 0;
    }

    return $arr;
}
$num_list1 = array(0,2,3,4,6,7,10);
$num_list2 = array(10,0,11,12,0,14,17);
print_r(move_zero($num_list1));
print_r(move_zero($num_list2));
?>

Sample Output: 

Array                                                       
(                                                           
    [0] => 2                                                
    [1] => 3                                                
    [2] => 4                                                
    [3] => 6                                                
    [4] => 7                                                
    [5] => 10                                               
    [6] => 0                                                
)                                                           
Array                                                       
(                                                           
    [0] => 10                                               
    [1] => 11                                               
    [2] => 12                                               
    [3] => 14                                               
    [4] => 17                                               
    [5] => 0                                                
    [6] => 0                                                
)

Flowchart:

PHP Flowchart: Push all zeros to the end of an array

PHP Code Editor:

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Previous: Write a PHP program to check if a given string is an anagram of another given string.
Next: Write a PHP program to find majority element in an array.

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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