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Title : quick sort for associative arrays
Categories : Algorithms, Arrays, PHP Update Picture
David Sklar
Date : Jan 16th 1999
Grade : 3 of 5 (graded 2 times)
Viewed : 7807
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Search : More code by David Sklar
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Tools : My Examples List
Code

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<?

function qsort($a,$f) {
qsort_do(&$a,0,Count($a)-1,$f);
}

function qsort_do($a,$l,$r,$f) {
if ($l < $r) {
qsort_partition(&$a,$l,$r,&$lp,&$rp,$f);
qsort_do(&$a,$l,$lp,$f);
qsort_do(&$a,$rp,$r,$f);
}
}

function qsort_partition($a,$l,$r,$lp,$rp,$f) {
$i = $l+1;
$j = $l+1;

while ($j <= $r) {
if ($f($a[$j],$a[$l])) {
$tmp = $a[$j];
$a[$j] = $a[$i];
$a[$i] = $tmp;
$i++;
}
$j++;
}

$x = $a[$l];
$a[$l] = $a[$i-1];
$a[$i-1] = $x;

$lp = $i - 2;
$rp = $i;
}

?>



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