http://stackoverflow.com/questions/13364680/convert-word-into-number-for-lexicographical-order Lexicographical Ordering

bubble_sort.php

<?php

usort($unsortedObjectArray, function( $a, $b ) { 
    if ($a->weight == $b->weight) { 
        return 0;
    }
    return ($a->weight < $b->weight) ? -1 : 1;
});

word-score.php

<?php

$words = array('abcd', 'hello', 'dogs', 'hiya');
$newWords = array(); 
foreach ($words as $word) {

$len = strlen($word);

    if ($len > 4) {
        $len = 4;
    }

    $i = 0;
    $j = $len - 1;
    $score = 0;

    while ($i < $len) {
        $byte = ord($word[$i]);
        $score += $byte * pow(256, $j);
        $i++;
        $j--;
    }

    $newWords[$score] = $word;
}
ksort($newWords);
print_r($newWords);