遍历表单元素数组列表以获取或获取我们需要或想要保留的元素

Question

这是我当前的代码，我正在寻找一种更有效的编写方式。

需要使用 foreach 循环遍历每个变量或以某种方式将它们全部添加到数组中，而无需我重新编写每个变量名称。

$formValues = $form_state->getValues();    

$relocation = $formValues['relocation'];
$europe = $formValues['europe'];
$twoyears = $formValues['twoyears'];
$realestate = $formValues['realestate'];
$nominated = $formValues['check_nominated_by'];
$nom_comp = $formValues['nom_company'];
$nom_contact = $formValues['nom_contact'];
$nom_email = $formValues['nom_email'];
$contact1 = $formValues['contact1'];
$position1 = $formValues['contact_position1'];
$email1 = $formValues['email1'];
$contact2 = $formValues['contact2'];
$position2 = $formValues['contact2'];
$email2 = $formValues['contact2'];
$contact3 = $formValues['contact3'];
$position3 = $formValues['contact3'];
$email3 = $formValues['contact3'];


tempstore = array();
$tempstore['relocation'] = $relocation;
$tempstore['europe'] = $europe;
$tempstore['twoyears'] = $twoyears;
$tempstore['realestate'] = $realestate;
$tempstore['membertype'] = $membertype;
$tempstore['nominated_by'] = '';
// All other fields need to be in this array too
// But there are a lot of unwanted fields in the $formValues
$_SESSION['sessionName']['formName'] = $tempstore;

Answer 1

既然您知道要保留的密钥，您可以执行以下操作：

<?php

/** The keys you want to keep... **/
$keys_to_keep = [

];

/** Will be used to store values for saving to $_SESSION. **/
$temp_array = [];

/** Loop through the keys/values. **/
foreach ($formValues as $key => $value) {
    /** The correct key i.e. the key you'd like to save. **/
    if (in_array($key, $keys_to_keep)) {
        /** What you wish to do... **/
        $temp_array[$key] = $value;
    }
}


$_SESSION['sessionName']['formName'] = $temp_array;
?>

正在发生的事情是，您正在循环遍历您的 $formValues 并获取 both 数组中每一对的键和值。

然后将对您的$keys_to_keep 进行检查，以查看当前元素是否是您希望保留的元素，如果是，则将其保存到$temp_array。

阅读材料

foreach

in_array

Answer 2

您可以使用可变变量和 foreach。

Foreach($formValues as $key => $var){
    $$key = $var;
}

Echo $relocation ."\n" . $europe;

https://3v4l.org/QeLjp

编辑我现在看到您的数组变量键并不总是与您想要的变量名称相同。 在这种情况下，您不能使用上述方法。
在这种情况下，您需要使用 list() = array.

List($relocation, $europe) = $formValues;
// The list variables have to be in correct order I just took the first two for demo purpose.