php合并排序

$a = array(1,5,12,16);

$b = array(2,3,15,19,25);

$c = array(); 

$ak = $bk = 0;

$countA = count($a); 

$countB = count($b);

$countAB = $countA + $countB;



for($i=0; $i<$countAB; $i++) {

    if($ak<$countA && $bk<$countB) {

        if($a[$ak] < $b[$bk] ) {

            $c[$i] = $a[$ak]; 

            unset($a[$ak]);

            $ak++;

        } else {

            $c[$i] = $b[$bk]; 

            unset($b[$bk]);

            $bk++;

        }

    }

}



$end = $a ? $a : $b;

foreach($end as $v) {

    array_push($c, $v);

}



echo '<pre>';print_r($c);die;