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preserve key order stable sort when sorting with phps uasort


preserve key order stable sort when sorting with phps uasort  using -'php,arrays,algorithm,sorting'

This question is actually inspired from another one here on SO and I wanted to expand it a bit.

Having an associative array in PHP is it possible to sort its values, but where the values are equal to preserve the original key order, using one (or more) of PHP's built in sort function?

Here is a script I used to test possible solutions (haven't found any):

<?php
header('Content-type: text/plain');
for($i=0;$i<10;$i++){
    $arr['key-'.$i] = rand(1,5)*10;
}
uasort($arr, function($a, $b){
    // sort condition may go here //
    // Tried: return ($a == $b)?1:($a - $b); //
    // Tried: return $a >= $b; //
});
print_r($arr);
?>


Pitfall: Because the keys are ordered in the original array, please don't be tempted to suggest any sorting by key to restore to the original order. I made the example with them ordered to be easier to visually check their order in the output.

Thank you for your tested input,
Alin
    
asked Sep 14, 2015 by LasSander
0 votes
7 views



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