PHP Array Exercises : Shuffle an associative array, preserving key, value pairs
PHP Array: Exercise-26 with Solution
Write a PHP function to shuffle an associative array, preserving key, value pairs.
Sample Solution:
PHP Code:
<?php
function shuffle_assoc($my_array)
{
$keys = array_keys($my_array);
shuffle($keys);
foreach($keys as $key) {
$new[$key] = $my_array[$key];
}
$my_array = $new;
return $my_array;
}
$colors = array("color1"=>"Red", "color2"=>"Green", "color3"=>"Yellow");
print_r(shuffle_assoc($colors));
?>
Sample Output:
Array ( [color1] => Red [color2] => Green [color3] => Yellow )
Flowchart:
PHP Code Editor:
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Previous: Write a PHP function to sort entity letters.
Next: Write a PHP function to generate a random password (contains uppercase, lowercase, numeric and other) using shuffle() function.
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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
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