php 将值添加到 foreach 循环内的数组
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Add values to an array inside a foreach loop
提问by zessx
I'm trying to edit an array on the fly, inside a foreachloop. I basically analyse each key, and if this key match the one I want, I want to add another entry in the array immediately after this one.
我正在尝试在foreach循环内动态编辑数组。我基本上分析了每个键，如果这个键与我想要的键匹配，我想在这个键之后立即在数组中添加另一个条目。
If I take this code,
如果我拿这个代码，
$values = array(
'foo' => 10,
'bar' => 20,
'baz' => 30
);
foreach($values as $key => $value){
print $value . ' ';
if($key == 'bar'){
$values['qux'] = 21;
}
}
I've got 2 problems,
我有2个问题，
- first, the output is
10 20 30instead of the expected10 20 30 21 - second, even if I solve the first problem, my value will still be added at the endof my array
- 首先，输出
10 20 30不是预期的10 20 30 21 - 第二，即使我解决了第一个问题，我的值仍然会添加到我的数组末尾
How could I add the quxentry between barand bazones?
我怎么能qux在bar和之间添加条目baz？
Thanks for your ideas.
谢谢你的想法。
回答by Lars Ebert
Foreach will not loop through new values added to the array while inside the loop.
Foreach 不会在循环内遍历添加到数组中的新值。
If you want to add the new value between two existing values, you could use a second array:
如果要在两个现有值之间添加新值，可以使用第二个数组：
$values = array(
'foo' => 10,
'bar' => 20,
'baz' => 30
);
$newValues = array();
foreach($values as $key => $value)
{
$newValues[$key] = $value;
if($key == 'bar')
{
$newValues['qux'] = 21;
}
}
print implode(' ', $newValue);
Also, see one of my favorite questions on StackOverflow discussing the foreach loop: How does PHP 'foreach' actually work?
另外，请参阅我在 StackOverflow 上讨论 foreach 循环时最喜欢的问题之一：PHP 'foreach' 实际上是如何工作的？
回答by Radiumrasheed
You can use the ampersand sign before the value.
您可以在值前使用与号。
//populate all the promos into their promoG groups
foreach($unclaimedPromoGroups as &$unclaimedPromoGroup) {
$_promo = new Promo();
$_promo->promoGroupID = $unclaimedPromoGroup['promo_groupID'];
$promo = $_promo->getGroupPromos();
$unclaimedPromoGroup["promos"] = $promo;
}
回答by Parag Tyagi -morpheus-
For this you need to create a new array,
为此，您需要创建一个新数组，
<?php
$values = array(
'foo' => 10,
'bar' => 20,
'baz' => 30
);
$newarray = array();
foreach($values as $k => $v)
{
$newarray[$k] = $v;
if($k == 'bar')
$newarray['qux'] = 21;
}
echo implode(' ', $newarray);
演示：http:
//3v4l.org/N4XgB
回答by QHip
The solution below uses the same array.
下面的解决方案使用相同的数组。
$values = array(
'foo' => 10,
'bar' => 20,
'baz' => 30
);
function match($niddle, $haystack, $push, $offset = 0) {
foreach(array_slice($haystack, $offset) as $key => $value)
{
print $value . ' ';
if($key == $niddle)
{
$i = array_search($niddle, array_keys($haystack)) + 1;
$haystack = array_slice($haystack, 0, $i, true) + $push + array_slice($haystack, $i, count($haystack) - $i, true);
$haystack = match($niddle, $haystack, $push, $i);
break;
}
}
return $haystack;
}
$values = match('bar', $values, array('qux'=>21));
var_dump($values);
