在 PHP 中使用 for 和 foreach 打印具有不同名称的数组答案

【问题标题】：Printing arrays with different names using for and foreach in PHP在 PHP 中使用 for 和 foreach 打印具有不同名称的数组
【发布时间】：2021-11-17 18:13:25
【问题描述】：

我是 PHP 新手，想知道是否有解决此问题的简单方法。

$class_1 = array("Name" => "Lule", "Surname" => "Mirela", "Email" => "Lule@gmail.com", "Birthday" => "30/04/2001");
$class_2 = array("Name" => "Aida", "Surname" => "Besim", "Email" => "Aida@gmail.com", "Birthday" => "16/11/2001");
$class_3 = array("Name" => "Flaka", "Surname" => "Agim", "Email" => "Flaka@gmail.com", "Birthday" => "23/09/2003");
for($i = 1; $i <= 3; $i++) {
    foreach ($class_1 as $key => $val) {
        echo $key. ": ";
        echo $val. "<br/>";
    }
}

从技术上讲，我认为只写$class_$i 是可能的，但这似乎不起作用。我不熟悉 PHP 语法。

【问题讨论】：

标签： php arrays for-loop foreach associative-array

【解决方案1】：

您要查找的内容称为“variable variables”。您必须构建一个包含数组名称的变量并将其与双美元符号一起使用：

$class_1 = array("Name" => "Lule", "Surname" => "Mirela", "Email" => "Lule@gmail.com", "Birthday" => "30/04/2001");
$class_2 = array("Name" => "Aida", "Surname" => "Besim", "Email" => "Aida@gmail.com", "Birthday" => "16/11/2001");
$class_3 = array("Name" => "Flaka", "Surname" => "Agim", "Email" => "Flaka@gmail.com", "Birthday" => "23/09/2003");
for($i = 1; $i <= 3; $i++) {
    $array = "class_$i";
    foreach ($$array as $key => $val) {
        echo $key. ": ";
        echo $val. "<br/>";
    }
}

或者更简洁：

$class_1 = array("Name" => "Lule", "Surname" => "Mirela", "Email" => "Lule@gmail.com", "Birthday" => "30/04/2001");
$class_2 = array("Name" => "Aida", "Surname" => "Besim", "Email" => "Aida@gmail.com", "Birthday" => "16/11/2001");
$class_3 = array("Name" => "Flaka", "Surname" => "Agim", "Email" => "Flaka@gmail.com", "Birthday" => "23/09/2003");
for($i = 1; $i <= 3; $i++) {
    foreach (${"class_$i"} as $key => $val) {
        echo $key. ": ";
        echo $val. "<br/>";
    }
}

但是在我看来，按照@Akshay Pose 的建议制作一个数组通常会更好。

【讨论】：

【解决方案2】：

尝试使用多维数组。像这样的。


$class[0] = array("Name" => "Lule", "Surname" => "Mirela", "Email" => "Lule@gmail.com", "Birthday" => "30/04/2001");
$class[1] = array("Name" => "Aida", "Surname" => "Besim", "Email" => "Aida@gmail.com", "Birthday" => "16/11/2001");
$class[2] = array("Name" => "Flaka", "Surname" => "Agim", "Email" => "Flaka@gmail.com", "Birthday" => "23/09/2003");
for($i = 0; $i <= 2; $i++) {
    foreach ($class[$i] as $key => $val) {
        echo $key. ": ";
        echo $val. "<br/>";
    }
}

另外，将类作为变量名是一个糟糕的主意。

【讨论】：