在 foreach 中,isLastItem() 存在吗?

2021-12-26 00:00:00 foreach php

使用常规的 for 循环,可以将当前索引与最后一个进行比较,以判断我是否处于循环的最后一次迭代中.使用 foreach 时是否有类似的事情?我的意思是这样的.

Using a regular for loop, it's possible to comapred the current index with the last to tell if I'm in the last iteration of the loop. Is there a similar thing when using foreach? I mean something like this.

foreach($array as $item){
  //do stuff
  //then check if we're in the last iteration of the loop
  $last_iteration = islast(); //boolean true/false
}

如果没有,是否至少有一种方法可以知道当前迭代的当前索引,例如 $iteration = 5,以便我可以手动将其与 $array 的长度进行比较?

If not, is there at least a way to know the current index of the current iteration like $iteration = 5, so I can manually compare it to the length of the $array?

推荐答案

您可以组合使用 SPL 的 href="http://php.net/class.arrayiterator">ArrayIterator 和 CachingIterator 类有一个 hasNext 方法:

You can use a combination of SPL’s ArrayIterator and CachingIterator class to have a hasNext method:

$iter = new CachingIterator(new ArrayIterator($arr));
foreach ($iter as $value) {
    $last_iteration = !$iter->hasNext();
}

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