怎么把这两个函数相同的键值相加形成新的数组

<?php$a1 = '10,20,30,40;1,2,3,4';//分号无限往后扩展$a = explode(';', $a1);$b1 = '11111;22222';//分号无限往后扩展，能与$a1对齐叠加$b = explode(';', $b1);print_r($a);print_r($b);?>

$a1 = '10,20,30,40;1,2,3,4';//分号无限往后扩展$a = explode(';', $a1);$b1 = '11111;22222';//分号无限往后扩展，能与$a1对齐叠加$b = explode(';', $b1);$c = array_map(null, $a, $b);print_r($c);

Array(    [0] => Array        (            [0] => 10,20,30,40            [1] => 11111        )    [1] => Array        (            [0] => 1,2,3,4            [1] => 22222        ))

$a1 = '10,20,30,40;1,2,3,4';//分号无限往后扩展$a = explode(';', $a1);$b1 = '11111;22222';//分号无限往后扩展，能与$a1对齐叠加$b = explode(';', $b1); $c=array();foreach($a as $key=>$value){    $c[]=$value.",".$b[$key];}echo '<pre class="brush:php;toolbar:false;">';print_r($c);

$a1 = '10,20,30,40;1,2,3,4';//分号无限往后扩展$a = explode(';', $a1);$b1 = '11111;22222';//分号无限往后扩展，能与$a1对齐叠加$b = explode(';', $b1);function combine($arr){	return implode(',',$arr);}$c = array_map('combine', array_map(null, $a, $b));print_r($c);