Php数组元素差异

有两个阵列：

Array1 ( 
[309] => "100"
[310] => "200"
[311] => "400"
)

Array2 ( 
[309] => "1"
[310] => "2"
[311] => "4"
) 

如何从数组中获得元素不同的结果数组？i、 e:

Array3 ( 
    [309] => "99"
    [310] => "198"
    [311] => "396"
    ) 

谢谢

试试这个

<?php

$arr1 = array(309=>"100",310=>"200",311=>"400");
$arr2 = array(309=>"1",310=>"2",311=>"4");

$out = array();
foreach($arr1 as $k => $v){
    // Since you need quote so, otherwise no need
    $out[$k] = '"'.($v - $arr2[$k]).'"';
}
print_r($out);

?>

<?php
$a1=array("309"=>"100","310"=>"200","311"=>"400");
$a2=array("309"=>"1","310"=>"2","311"=>"4");
$res = array();
foreach ($a1 as $key => $value) {

   $res[$key] = $a1[$key]-$a2[$key];
}


print_r($res);
?>

---

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<?php
$a1=array("309"=>"100","310"=>"200","311"=>"400");
$a2=array("309"=>"1","310"=>"2","311"=>"4");
$res = array();
foreach ($a1 as $key => $value) {

   $res[$key] = $a1[$key]-$a2[$key];
}


print_r($res);
?>

 Array ( 
    [309] => "99"
    [310] => "198"
    [311] => "396"
    )