我知道有很多关于将PHP数组转换为Javascript的问题，标准答案如下：
tempary=<?php echo json_encode($tmpary); ?>;
但是，当我尝试访问数组时，我无法访问这些元素。 e.g。
document.write(tempary[2]); //debug
即使我知道有第3个元素。
以下是实际代码：
global $wpdb;
$query="SELECT * FROM wp_ta_members";
$member_table=$wpdb->get_results($query);
echo "<p>Size of wp_ta_members table is " . count($member_table) . "</p>"; //debug
?>
<script type="text/javascript">
var members = [];
var tempary = [];
</script>
<?php
foreach ($member_table as $member_row)
{
$tmpary=array($member_row->member_id,
($member_row->current==1)?"current":"not a member",
$member_row->date_joined,
$member_row->title,
$member_row->first_names,
$member_row->last_names)
?>
<script type="text/javascript">
tempary=<?php echo json_encode($tmpary); ?>;
document.write(tempary[2]); //debug
console.log(tempary); //debug
members.push(tempary.concat());
</script>
<?php }
?>
您会注意到我实际上正在创建一个数组数组，稍后我将使用以下循环处理：
for (mem in members)
{
document.write(workary.length + " " + members.length + " " + mem.length + " " + members[1] + "<br />"); //debug
document.write(mem[1] + " " + mem[2] + " " + mem[3] + " " + mem[4] +"<br />"); //debug
}
然而，我得到的所有tempary [0]都是＆＃34; 1＆＃34;以及任何其他元素 - ＆＃34; undefined＆＃34;。
如果我输出tempary本身，我会得到一个由逗号分隔的所有元素的字符串。
我错过了什么？我希望tempary成为一个合适的JavaScript数组。
很抱歉再次回来，但这仍然无效
我已将以下代码添加到脚本中，只是为了查看概念：
var a1 = [100, "scooby", "doo"];
var a2 = [200, "soup", "dragon"];
var a3 = [];
a3.push(a1);
a3.push(a2);
console.log(a3);
console.log(a3[0]);
console.log(a3[1]);
console.log(a3[1][0] + " " + a3[1][1]);
结果是：
[Array[3], Array[3]]
[100, "scooby", "doo"]
[200, "soup", "dragon"]
200 soup
这是正确的！
当我运行我的真实代码并执行这些行（在循环中）时：
console.log(tempary); //debug
members.push(tempary);
我得到了结果：
["78", "current", "2014-01-01", "", "Fred", "Bloggs"]
这也是正确的（虽然我更希望＆＃34; 78＆＃34;存储为数字而不是字符串 - 但这是另一个故事）。
然而，当我执行一个循环时，使用：
打印出数组数组的内容for (mem in members)
{
console.log(members.length + " " + mem.length + " " + members[1]); //debug
console.log(mem + " " + mem[0] + " " + mem[1] + " " + mem[2] + " " + mem[3] + " " + mem[4]); //debug
}
我得到一个重复的日志列表：
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
0 0 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
1 1 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
2 2 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
3 3 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
4 4 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
5 5 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
6 6 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
7 7 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
8 8 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
9 9 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
10 1 0 undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
11 1 1 undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
12 1 2 undefined undefined undefined
其中1333是成员数组中的数组数。 Joe Soap是列表中的最后一个成员。 为什么console.log（mem）;产生一个递增的数字我不知道。当这个数字达到两位数时会发生另一种奇怪的事情，例如： 12使mem [0] = 1和mem [1] = 2 !! mem的其余元素是＆＃34; undefined＆＃34;。
为了完整起见，这是整个脚本：
<?php
/***** php and javascript to administer member details *****/
// **** get entire members table into a variable
global $wpdb;
$query="SELECT * FROM wp_ta_members";
$member_table=$wpdb->get_results($query);
echo "<p>Size of wp_ta_members table is " . count($member_table) . "</p>"; //debug
?>
<script type="text/javascript">
var members = [2000];
var tempary = [];
var a1 = ["100", "scooby", "doo"]; //test
var a2 = ["200", "soup", "dragon"]; //test
var a3 = []; //test
a3.push(a1); //test
a3.push(a2); //test
console.log(a3);
console.log(a3[0]);
console.log(a3[1]);
console.log(a3[1][0] + " " + a3[1][1]);
<?php
foreach ($member_table as $member_row)
{
$tmpary=array($member_row->member_id,
($member_row->current==1)?"current":"not a member",
$member_row->date_joined,
$member_row->title,
$member_row->first_names,
$member_row->last_names);
$x = 0;
foreach($tmpary as $value){
echo 'tempary[' . $x . '] = "' . $value . '";';
$x++;
}
?>
// tempary=JSON.parse("<?php echo json_encode($tmpary); ?>");
document.write(tempary[4] +"<br />"); //debug
console.log(tempary); //debug
members.push(tempary);
<?php }
?>
document.write(members + "<br />"); //debug
document.write("Hi Will again<br />"); //debug
for (mem in members)
{
console.log(members.length + " " + mem.length + " " + members[1]); //debug
console.log(mem + " " + mem[0] + " " + mem[1] + " " + mem[2] + " " + mem[3] + " " + mem[4]); //debug
}
</script>
我已经和他一起摔跤已经好几天了，而且已经没想完了。任何帮助将不胜感激。
答案 0 :(得分：1)
我看到你在每次迭代时都要覆盖你的临时数组。所以当你json_encode时，你只剩下最后一项了。
请改为尝试：
global $wpdb;
$query="SELECT * FROM wp_ta_members";
$member_table=$wpdb->get_results($query);
echo "<p>Size of wp_ta_members table is " . count($member_table) . "</p>"; //debug
?>
<script type="text/javascript">
<?php
$members = array();
foreach ($member_table as $member_row){
$member = array(
$member_row->member_id,
($member_row->current==1)?"current":"not a member",
$member_row->date_joined,
$member_row->title,
$member_row->first_names,
$member_row->last_names
);
$members[] = $member;
}
?>
var members = <?php echo json_encode($members) ?>;
</script>
<?php }
?>
答案 1 :(得分：1)
我发现了问题所在。特别是 killneel 谁为2D阵列问题提出了一个非常优雅的解决方案。 事实证明，问题的关键在于我访问阵列的方式。仅供参考NEVER用户使用for..in循环来处理数组！使用起来要好得多：
var len = arr.length;
for (var i=0; i<len; i++) {
console.log(arr[0]; // or whatever you want to do with the array element
}
答案 2 :(得分：0)
使用foreach循环并在声明JS数组后在每次迭代中写出JS代码：
<script>
var js_array = new Array();
<?php
$x = 0;
foreach($item as $key => $value){
echo 'js_array[$x] = "' . $value . '";';
$x++;
}
?>
</script>