PHP foreach 循环中的多个索引变量
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Multiple index variables in PHP foreach loop
提问by Donald Taylor
Is it possible to have a foreachloop in PHP with multiple "index" variables, akin to the following (which doesn't use correct syntax)?
是否可以foreach在 PHP 中使用多个“索引”变量进行循环，类似于以下内容（不使用正确的语法）？
foreach ($courses as $course, $sections as $section)
If not, is there a good way to achieve the same result?
如果没有，是否有达到相同结果的好方法？
回答by Will
to achieve just that result you could do
为了达到你可以做的结果
foreach (array_combine($courses, $sections) as $course => $section)
but that only works for two arrays
但这仅适用于两个数组
回答by codaddict
If both the arrays are of the same size you can use a forloop as:
如果两个数组的大小相同，您可以使用for循环作为：
for($i=0, $count = count($courses);$i<$count;$i++) {
$course = $courses[$i];
$section = $sections[$i];
}
回答by Alan Geleynse
You would need to use nested loops like this:
您需要使用这样的嵌套循环：
foreach($courses as $course)
{
foreach($sections as $section)
{
}
}
Of course, this will loop over every section for every course.
当然，这将遍历每个课程的每个部分。
If you want to look at each pair, you are better off using either objects that contain the course/section pairs and looping over those, or making sure the indexes are the same and doing:
如果您想查看每一对，最好使用包含课程/部分对的对象并循环遍历它们，或者确保索引相同并执行以下操作：
foreach($courses as $key => $course)
{
$section = $sections[$key];
}
回答by T.Todua
TRY -
尝试 -
1)
1)
<?php
$FirstArray = array('a', 'b', 'c', 'd');
$SecondArray = array('1', '2', '3', '4');
foreach($FirstArray as $index => $value) {
echo $FirstArray[$index].$SecondArray[$index];
echo "<br/>";
}
?>
or 2)
或 2)
<?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 Daimon
No, because those arrays may have other number of items.
不，因为这些数组可能有其他数量的项目。
You must explicitely write something like that:
你必须明确地写这样的东西：
for ($i = 0; $i < count($courses) && $i < count($sections); ++$i) {
$course = $courses[$i];
$section = $sections[$i];
//here the code you wanted before
}
回答by AndreKR
No, this is maybe one of the rare cases PHP's array cursors are useful:
不，这可能是 PHP 的数组游标有用的罕见情况之一：
reset($sections);
foreach ($courses as $course)
{
list($section) = each($sections);
}
回答by VoteyDisciple
What would that do, exactly? Are $coursesand $sectionsjust two separate arrays, and you want to perform the same function for the values in each? You could always do:
那会做什么呢？是$courses和$sections刚才两个独立的阵列，并且要执行相同的功能在每个值是多少？你总是可以这样做：
foreach(array_merge($courses, $sections) as $thing) { ... }
This makes all the usual assumptions about array_merge, of course.
array_merge当然，这做出了关于 的所有通常假设。
Or is it that $sectionscomes from $courseand you want to do something for each section in each course?
或者它$sections来自$course并且您想为每个课程的每个部分做一些事情？
foreach($courses as $course) {
foreach($sections as $section) {
// Here ya go
}
}
回答by Edmhs
like this?
像这样？
foreach($array as $b=>$c){
}
