php 如何从传递给 for 循环的数组中访问“键”和“值”？
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How to access "key" and "value" from an array passed to a for loop?
提问by Scott B
How can I change the foreachloop below so that I can assign the $myradiooptionarray's keyas the valuefor each input instead of the array's optionvalue as I'm now doing (I still want to echo the array's optionvalue as the label)?
我怎样才能改变foreach循环之下，这样我可以指定$myradiooption数组key的value每个输入而非阵列的option价值，因为我现在做的（我还是想呼应数组option作为标签值）？
<?php
$myradiooptions = array(
"grid1" => "Grid View (default)",
"list1" => "List View (1 column)",
"list2" => "List View (2 column)"
);
array(
"name" => "Category Layout",
"desc" => "description goes here",
"id" => "my_category_layout",
"type" => "radio",
"options" => $myradiooptions )
);
//switch, case "radio":
?>
<li class="section">
<label
class="left"
for="<?php echo $value['id']; ?>">
<?php echo $value['name']; ?>
</label>
<?php
$count=1;
foreach ($value['options'] as $option) {
?>
<input
type="radio"
name="<?php echo $value['id']; ?>"
id="<?php echo $count; ?>"
value="<?php echo $option; ?>"
<?php checked($option, get_settings($value['id'])); ?>
/>
<label style="color:#666; margin:0 20px 0 5px;" for="<?php echo $count; ?>">
<?php echo $option; ?>
</label>
<?php $count++;} ?>
<label class="description" style="margin-top:-5px;">
<?php echo $value['desc']; ?>
</label>
</li>
<?php break;
回答by Nanne
I think what you are looking for is this:
我想你要找的是这个：
foreach ($value['options'] as $key=>$option)
Now you can access the key as $key, and the option as $option
现在您可以访问密钥为$key，选项为$option
回答by Sebastian Paaske T?rholm
If you want to access the key of an array in a foreach loop, you use the following syntax:
如果要在 foreach 循环中访问数组的键，请使用以下语法：
foreach ($array as $key => $value) { ... }
References: foreachin the PHP documentation
参考资料：foreach在 PHP 文档中
回答by John Parker
If you want to extract key/value pairs from an associative array, simply use...
如果要从关联数组中提取键/值对，只需使用...
foreach ($yourArray as $key => $value) {
...
}
...as per the PHP foreach manual page.
...根据PHP foreach 手册页。
回答by bharath
the whole thing can be changed to something like this for better readability...
为了更好的可读性，整个事情都可以改成这样……
<?php
$myradiooptions = array(
"grid1" => "Grid View (default)",
"list1" => "List View (1 column)",
"list2" => "List View (2 column)"
);
$value = array(
"name" => "Category Layout",
"desc" => "description goes here",
"id" => "my_category_layout",
"type" => "radio",
"options" => $myradiooptions
);
foreach($value as $key => $val)
{
$formHTML = "<label class='left' for='{$value['id']}'>".$value['name']."</label>";
if(is_array($val))
{
$count = 1;
foreach($val as $k => $v)
{
$formHTML .= "<input type='radio' name='{$v['id']}' id='$count' value='$v' /><label style='color:#666; margin:0 20px 0 5px;' for='$count'>$v</label>";
$count ++;
}
}
$formHTML .= "<label class='description' style='margin-top:-5px;'>".$value['desc']."</label>";
}
//switch, case "radio":
?>
<li class="section">
<?php print $formHTML; ?>
</li>
回答by Reinderien
This should explain it pretty well:
这应该很好地解释了它：
http://www.tech-recipes.com/rx/295/php-syntax-iterate-over-an-associative-array/
http://www.tech-recipes.com/rx/295/php-syntax-iterate-over-an-associative-array/
