如何从php中的另一个数组中读取一个数组值？答案

【问题标题】：how to read an array value from another array in php?如何从php中的另一个数组中读取一个数组值？
【发布时间】：2015-02-28 16:50:38
【问题描述】：

有没有办法从另一个数组中读取？

这是我的 2 数组，

$productArr = [
    "PT" => [
        "cat" => [ "image" => "cat.jpg", "desc" => "blah blah"],
        "fish"=> [ "image" => "fish.jpg", "desc" => "blah blah"],
        "dog" => [ "image" => "dog.jpg","desc" => "blah blah"],
    ],
    "KC" => [
        "Ice" => [ "image" =>   "ice.jpg", "desc" => "mah mah mah"],
        "cold"=> [ "image" => "cold.jpg", "desc" => "mah mah mah"],
        "water"=> [ "image" =>   "water.jpg", "desc" => "mah mah mah"],
    ],

];

$featuredArr = [
    "KC" => "Ice",
    "PT" => "cat",
];

例如，从$featuredArr，“Ice”将与$productArr“Ice”链接，生成“desc”和“image”。

【问题讨论】：

只需将该值用作键，它们无论如何都存在于另一个上，如果您想要检查，只需添加一个 isset 或数组键是否存在，检查下面的答案

标签： php arrays multidimensional-array foreach

【解决方案1】：

$productArr = [
    "PT" => [
        "cat" => [ "image" => "cat.jpg", "desc" => "blah blah"],
        "fish"=> [ "image" => "fish.jpg", "desc" => "blah blah"],
        "dog" => [ "image" => "dog.jpg","desc" => "blah blah"],
    ],
    "KC" => [
        "Ice" => [ "image" =>   "ice.jpg", "desc" => "mah mah mah"],
        "cold"=> [ "image" => "cold.jpg", "desc" => "mah mah mah"],
        "water"=> [ "image" =>   "water.jpg", "desc" => "mah mah mah"],
    ],

];

$featuredArr = [
    "KC" => "Ice",
    "PT" => "cat",
];

foreach ($featuredArr as $key => $value) {
   if ($productArr[$key][$value]) {
      echo "key $key=>$value exists:  <br />";
      foreach ($productArr[$key][$value] as $newKey => $newValue) {
         echo "$newKey :: $newValue <br />";
      }
   }
}

输出：

key KC=>Ice exists:  <br />image :: ice.jpg <br />desc :: mah mah mah <br />key PT=>cat exists:  <br />image :: cat.jpg <br />desc :: blah blah <br />

请注意，这在很大程度上取决于您对键和值的用途：使用上面的代码，您可以通过将所需的键=>值对添加到 $featuredArr 数组来动态循环遍历您的数组。

希望这会有所帮助。

【讨论】：

我在回显图像时遇到问题，您有解决方案吗？
什么问题？回显图像或正确显示它？打印标签时一定要检查图像的确切路径。

【解决方案2】：

试试这个：

foreach($featuredArr as $key=>$val)
    if($productArr[$key][$val])
        print_r($productArr[$key][$val]);

【讨论】：

【解决方案3】：

使用这个：

$code = "KC";
$product = $productArr[$code][$featuredArr[$code]];
echo $product['image'];
echo $product['desc'];

【讨论】：