如何使用变量变量访问数组中的指定键答案

【问题标题】：How do I access a specifing key in an array using variable variables如何使用变量变量访问数组中的指定键
【发布时间】：2016-06-08 16:40:08
【问题描述】：

我的问题太扭曲了，我什至不知道如何开始解释它。

假设我有几个关联数组（并不总是相同的数组：有时我有产品数组，有时我有市场数组，有时我有段数组，等等......）。 $values 是我总是得到的唯一数组！

$values = array ("0" => "1", "4" => "2", "5" => "3");
$products = array ("0" => "1", "1" => "1", "2" => "2", "3" => "1", "4" => "2", "5" => "3");
$markets =  array ("0" => "1",  "3" => "1", "4" => "2", "5" => "3");
...

我想用我得到的每个数组的值构建一个数组，其中的值与键匹配。类似的东西

$myArray = array ("0" => array ( "values" => "1", "products" => "1", "markets" => "1"),
                  "1" => array ( "products" => "1"),
                  "2" => array ( "products" => "2"),
                  "3" => array ( "products" => "1", "markets" => "1"),
                  "4" => array ( "values" => "2", "products" => "2", "markets" => 2),
                ...);

我尝试过这样的事情：

        switch ($_POST["cpv_type"]) {
            case "pClass":
                $keyValue = $_POST["cpv_type"];
                $objKey   = "this->productClasses";
                break;

            case "pMarket":
                $keyValue = $_POST["cpv_type"];
                $objKey   = "this->markets";
                break;

            case "pSegment":
                $keyValue = $_POST["cpv_type"];
                $objKey   = "this->productSegments";
                break;

            case "pType":
                $keyValue = $_POST["cpv_type"];
                $objKey   = "this->productTypes";
                break;

            default:
                $keyValue = "products";
                $objKey = "this->products";
                break;
        }

然后我做一个foreach cicle：

    // all values must be floats
    if(!empty($this->value)){
        foreach ($this->value as $key => &$curVal){
            // if no value has been entered, exclude it and also associated product from validation
            if (strlen(trim($curVal)) == 0) {
                unset($this->value[$key]);
                unset($this->products[$key]);
            } else {
                                        // This validates my variable 
                $curVal =   TMS::checkVar($curVal, "dec", $_SESSION["dico"]->_VALUE_, 100, false);


                                        // Store the value on existing array, associating "hoppValue" to the right key entry!
                $logDetail[$keyValue][${$objKey}[$key]]["hoppValue"] = $curVal;
            }
        }
    }

我的问题出在变量变量中：如何使用可变变量语法访问，例如$this->productTypes[5]？对于$$objKey、${$objKey}、${$objKey}[$key]、${$objKey[$key]}、$$objKey[$key] 的所有 var_dump，我得到“null”

感谢您的帮助！

【问题讨论】：

如果`$objKey = $this->productClasses`可以简单的获取数组并用作$objKey[$key]
你完全正确！答案如此简单，就在我眼前。工作日不应该这么长！（请将您的评论放入答案中，以便我将其标记为正确！）

标签： php arrays variables dynamic-variables

【解决方案1】：

您可以简单地获取数组以防$objKey = $this->productClasses 并用作$objKey[$key]。您可以将 $objKey 替换为 $arrayClasses 或类似的东西以获得良好的理解代码。

附言对不起我的英语。

【讨论】：