PHP foreach 循环遍历多维数组
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PHP foreach loop through multidimensional array
提问by Muiter
I have an multidimensional array, how can I use it? I want to use each separate array in a forloop.
我有一个多维数组，我该如何使用它？我想在for循环中使用每个单独的数组。
What I want to achive is to be able to put each part in my database like entry in db no. 0 -> 1 and 4 entry in db no. 1 -> 5 and 6 entry in db no. 2 -> 1 and 4 and 5 and 6
我想要实现的是能够将每个部分放入我的数据库中，就像 db 中的条目一样。0 -> 数据库编号中的 1 和 4 条目。1 -> 数据库编号中的 5 和 6 条目。2 -> 1 和 4 和 5 和 6
I have this code:
我有这个代码：
<?php
print_r($calculatie_id);
for ($i=0; $i<=3; $i++)
{
?>
<tr>
<td>
<?php
foreach ($calculatie_id[$i] as $value)
{
echo $value;
}
?>
print_r($calculatie_id); gives
Array ( [0] => Array ( [0] => 4 [1] => 6 ) [1] => Array ( [0] => 1 [1] => 5 ) [2] => Array ( [0] => 5 [1] => 6 ) [3] => )
But when using the foreachI only get 46
但是当使用foreach我只得到 46
Some extra information:
一些额外的信息：
This array is created by an multiple select in an for loop. Any other suggestions are welcome.
该数组由 for 循环中的多选创建。欢迎任何其他建议。
for ($i=0; $i<=$aantal_regels_corr; $i++)
{
?>
<tr>
<td>
<?php
// maak select name
$calculatie_id = 'calculatie_id'.$i;
// rest van formulier
if($error_vergeten[$i] == "ja"){ $error_omschr = $error_omschr_vergeten[$i]; include('includes/input_error.php'); } ?> <textarea rows="7" cols="80" name="omschrijving[]" /><?php echo $omschrijving[$i]; ?></textarea>
</td>
<td colspan="2">
<select multiple="multiple" width="50" size="7" name="<?php echo $calculatie_id ?>[]" style="width: 150px">
<?php
$sql_calc = "select id, naam, actief from sp_calculatie WHERE (offerte_id = '".$row['off_offerte']."' OR offerte_id = '".$offerte_id."') AND actief = 'ja' ORDER BY id ASC";
$res_calc = mysql_query($sql_calc,$con);
while ($row_calc = mysql_fetch_assoc($res_calc)){
?>
<option value="<?php echo $row_calc["id"] ?>"><?php if (empty($row_calc["naam"])) { echo $row_calc["id"]; } else { echo $row_calc["naam"]; } ?></option>
<?php } ?></select>
</td>
</tr>
<?php } ?>
回答by Cristian
foreach($calculatie_id as $inner_arr)
foreach($inner_arr as $value)
echo $value;
Edit:you should try to learn and understand what's going on here. Then, you can do whatever you want with the code I wrote. You said: gives 14561456 I want to use $calculatie_id0=14 $calculatie_id1=56 $calculatie_id2=1456etcThen, you will have to do something like this:
编辑：你应该尝试学习和理解这里发生了什么。然后，你可以用我写的代码做任何你想做的事情。你说：给出 14561456 我想使用$calculatie_id0=14 $calculatie_id1=56 $calculatie_id2=1456等然后，你将不得不做这样的事情：
foreach($calculatie_id as $index => $inner_arr){
echo "$calculatie_id$index = "
foreach($inner_arr as $value)
echo $value;
echo "<br/>";
}
Or you can create those variables you want (which does not make any sense for me):
或者你可以创建你想要的那些变量（这对我来说没有任何意义）：
foreach($calculatie_id as $index => $inner_arr){
${"calculatie_id$index"} = '';
foreach($inner_arr as $value)
${"calculatie_id$index"} .= $value;
echo ${"calculatie_id$index"}."<br/>";
}
回答by Daniel
Basically what you have is an array like this:
基本上你有一个这样的数组：
array(
array(
data
)
)
All you need is:
所有你需要的是：
foreach($yourArray as $innerArray)
foreach($innerArray as $value)
echo $value;
That will output what you want. I'm not particularly sure why you're doing a for() loop then a foreach.
这将输出你想要的。我不是特别确定您为什么要先执行 for() 循环然后再执行 foreach。
回答by Mitch Dempsey
You need to nest your foreachloops (so you have a loop inside a loop)
你需要嵌套你的foreach循环（所以你有一个循环内的循环）
回答by thesunneversets
You could try:
你可以试试：
foreach ($calculatie_id as $key => $value) {
echo "$calculatie_id:".$key;
for ($i=0;$i<=count($value);$i++) {
echo $value[$i];
}
}
回答by Kip
I don't understand why your original code snippet isn't working. Could it be the fact that $calculatie_id[3]is not an array?
我不明白为什么您的原始代码片段不起作用。难道$calculatie_id[3]不是数组的事实吗？
I tried this:
我试过这个：
<?php
$calculatie_id = array ( array(4,6), array(1,5), array(5,6), '' );
for ($i=0; $i<=3; $i++)
{
if(!is_array($calculatie_id[$i]))
continue;
echo "$i: ";
foreach ($calculatie_id[$i] as $value)
{
echo $value;
}
echo '<br/>';
}
And that prints:
然后打印：
0: 46
1: 15
2: 56
0：46
1：15
2：56
回答by Muiter
Many thanks for helping me out this far but all the examples I try to implement are not working. I have been trying this script for over 2 weeks now. It seems I'm going all the wrong way.
非常感谢您帮助我走到这一步，但我尝试实现的所有示例都不起作用。我已经尝试这个脚本超过 2 周了。看来我走错了路。
I have put my code online at www.pws.nl/downloads/sp_offerte_add.rar. It must be easier then what I'm writing in the code right now.
我已经把我的代码放到了 www.pws.nl/downloads/sp_offerte_add.rar。它一定比我现在在代码中写的更容易。
