function insertion_sort(&$a) {
$count = count($a);
for ($i = 0; $i < $count; $i++) {
$value = $a[$i];
for ($x = $i - 1; ( ($x >= 0) && ($a[$x] > $value) ); $x--) {
$a[$x + 1] = $a[$x];
}
$a[$x + 1] = $value;
}
}
$values = array(7, 3, 4, 6, 1);
insertion_sort($values);
foreach ($values as $v) { echo "{$v} "; }
?>