数组合并并显示空数据答案

【问题标题】：array merge and display with empty data数组合并并显示空数据
【发布时间】：2015-10-17 17:50:45
【问题描述】：

我有两个数组，如下所示

$array1 = array("color" => "red","size" => "32");
$array2 = array("color" => "blue","width" => "40");

我的php代码如下

    <?php
        $array1 = array("color" => "red","size" => "32");
        $array2 = array("color" => "blue","width" => "40");
        $result = array_merge_recursive($array1, $array2);
        echo json_encode($result);
?>

这段代码的输出是

{
color: [
"red",
"blue"
],
size: "32",
width: "40"
}

我想得到类似的输出

{
color: [
"red",
"blue"
],
size: [
"32",
""
],
width: [
"",
"40"
]
}

我怎样才能得到这个？请尽快帮帮我。

提前致谢。

【问题讨论】：

标签： php multidimensional-array merge

【解决方案1】：

将 array_merge 与默认值数组一起使用

$array1 = array("color" => "red","size" => "32");
$array2 = array("color" => "blue","width" => "40");
$arrayInit = array("color" => "","width" => "","size"=>"");
$array1 = array_merge($arrayInit,$array1);
$array2 = array_merge($arrayInit,$array2);
$result = array_merge_recursive($array1, $array2);
echo json_encode($result);

【讨论】：

【解决方案2】：

$keys = array_keys(array_merge($array1, $array2)); // get all the keys
foreach ($keys as $key) {
    // set each key in the result array to the value from the input array or a default ''
    $result[$key][] = isset($array1[$key]) ? $array1[$key] : '';
    $result[$key][] = isset($array2[$key]) ? $array2[$key] : '';
}
echo json_encode($result);

【讨论】：