在Javascript中使用PHP二维数组

Question

在PHP中我有这个数组

$MAtoJS[] = array('Max','Mustermann','N','A80');
$MAtoJS[] = array('Michaela','May','N','A78');
$MAtoJS[] = array('Hans','Gerstelhuber','N','M12');
$MAtoJS[] = array('Alfred E.','Neumann','N','T25');
$MAtoJS[] = array('James','Bond','N','M72');

仍然在php部分中，我为js准备了数组

$MAarrayForJS = json_encode(json_encode($MAForJS));

在javascript部分中，我创建了一个js-array

var MAarray = new Array(<?php echo $MAarrayForJS; ?>); alert(MAarray)

MAarray的内容是

[["Max","Mustermann","N","A80"],["Michaela","May","N","A78"],["Hans","Gerstelhuber","N","M12"],["Alfred E.","Neumann","N","T25"],["James","Bond","N","M72"]]

运用

console.log(MAarray[0]);

我试图通过此代码获取例如汉斯的名字

var FirstName = MAarray[0][2][1];

在console.log中导致“未定义”。

我如何访问特定数组中的特定值，在这种情况下，如何将第三个“子数组”中的var FirstName设置为值“ Hans”？

Answer 1

您在寻找...吗？

$MAtoJS = [];

$MAtoJS[] = array('Max','Mustermann','N','A80');
$MAtoJS[] = array('Michaela','May','N','A78');
$MAtoJS[] = array('Hans','Gerstelhuber','N','M12');
$MAtoJS[] = array('Alfred E.','Neumann','N','T25');
$MAtoJS[] = array('James','Bond','N','M72');

$MAarrayForJS = json_encode($MAtoJS);

?>

<script>
    var MAarray = <?php echo $MAarrayForJS; ?>;
    console.log(MAarray[0][0]); // Max
</script>

Answer 2

请注意，数组是2维的，而不是3维的，您正在访问第3维，它将始终产生未定义的状态，请查看下面的代码片段，在其中提取了值，并根据要求进行了更改：

 let MAarray = [["Max","Mustermann","N","A80"],["Michaela","May","N","A78"],["Hans","Gerstelhuber","N","M12"],["Alfred E.","Neumann","N","T25"],["James","Bond","N","M72"]]; console.log(MAarray[2][0]); MAarray[2][0] = "New Name"; console.log(MAarray[2][0]); 

Answer 3

由于某种原因，您使用json_encode 2次。 您只需要使用一次。

更改以下

$MAarrayForJS = json_encode(json_encode($MAForJS));

至

$MAarrayForJS = json_encode($MAtoJS);

然后在JS中可以使用console.log（MAarray [0] [2] [1]）;

Answer 4

尝试

var FirstName = MAarray[2][1];

似乎您正在尝试访问二维数组的第三级。