php 你如何将两个 foreach 循环合二为一
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How do you combine two foreach loops into one
提问by Kirk
The language is PHP. I have one foreach ( $a as $b) and another foreach ($c as $d => $e). How do i combine them to read as one. I tired foreach (($a as $b) && ($c as $d => $e)), but that is rubbish.
语言是 PHP。我有一个 foreach（$a 作为 $b）和另一个 foreach（$c 作为 $d => $e）。我如何将它们结合起来阅读。我厌倦了 foreach (($a as $b) && ($c as $d => $e))，但那是垃圾。
回答by VolkerK
You might be interested in SPL's MultipleIterator
您可能对SPL 的 MultipleIterator感兴趣
e.g.
例如
// ArrayIterator is just an example, could be any Iterator.
$a1 = new ArrayIterator(array(1, 2, 3, 4, 5, 6));
$a2 = new ArrayIterator(array(11, 12, 13, 14, 15, 16));
$it = new MultipleIterator;
$it->attachIterator($a1);
$it->attachIterator($a2);
foreach($it as $e) {
echo $e[0], ' | ', $e[1], "\n";
}
prints
印刷
1 | 11
2 | 12
3 | 13
4 | 14
5 | 15
6 | 16
回答by T.Todua
1) First method
1）第一种方法
<?php
$FirstArray = array('a', 'b', 'c', 'd');
$SecondArray = array('1', '2', '3', '4');
foreach(array_combine($FirstArray, $SecondArray) as $f => $n) {
echo $f.$n;
echo "<br/>";
}
?>
or 2) Second method
或 2) 第二种方法
<?php
$FirstArray = array('a', 'b', 'c', 'd');
$SecondArray = array('1', '2', '3', '4');
for ($index = 0 ; $index < count($FirstArray); $index ++) {
echo $FirstArray[$index] . $SecondArray[$index];
echo "<br/>";
}
?>
回答by cletus
I don't understand what you're trying to do. If you want to reach them one after the other just use two loops:
我不明白你想做什么。如果您想一个接一个地到达它们，只需使用两个循环：
foreach ($a as $b) { ... }
foreach ($c as $d => $e) { ... }
If you want all combinations from $aand $c:
如果您想要来自$a和的所有组合$c：
foreach ($a as $b) {
foreach ($c as $d => $e) {
// do stuff
}
}
I guess you could do something like:
我想你可以这样做：
foreach (array_merge($a, $c) as $k => $v) {
...
}
but I wouldn't necessarily advise it.
但我不一定会建议它。
回答by zombat
This will do what you want I think. It will be advance both arrays equally at the same time throughout your loop. You can always breakmanually if $cis a different size than $aand you need breaking logic based on array size:
这会做你想做的我认为。它将在整个循环中同时平等地推进两个数组。break如果$c大小$a与数组大小不同，并且需要根据数组大小破坏逻辑，则始终可以手动进行：
foreach($a as $b)
{
list($d,$e) = each($c);
//continue on with $b, $d and $e all set
}
each()will advance the array pointer of $con each iteration.
each()将$c在每次迭代中推进数组指针。
