PHP Array Exercises : Combine two arrays

Last update on May 30 2022 11:43:10 (UTC/GMT +8 hours)

PHP Array: Exercise-58 with Solution

Write a PHP script to combine (using one array for keys and another for its values) the following two arrays.

('x', 'y', 'y'), (10, 20, 30)

Sample Solution:

PHP Code:

<?php
function combine_Array($keys, $values)
{
    $result = array();
    foreach ($keys as $i => $k) {
        $result[$k][] = $values[$i];
    }
    array_walk($result, create_function('$v', '$v = (count($v) == 1)? array_pop($v): $v;'));
    return    $result;
}
$array1 = array('x', 'y', 'y');
$array2 = array(10, 20, 30);
print_r(combine_Array($array1, $array2));
?>

Sample Output:

Array                                                       
(                                                           
    [x] => Array                                            
        (                                                   
            [0] => 10                                       
        )                                                   
                                                            
    [y] => Array                                            
        (                                                   
            [0] => 20                                       
            [1] => 30                                       
        )                                                   
                                                            
)

Flowchart:

PHP Code Editor:

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Previous: Write a PHP function to compares two multidimensional arrays and returns the difference.
Next: Write a PHP program to create a range like the specified 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