获取foreach循环中的下一个元素 [英] Get next element in foreach loop

问题描述

我有一个foreach循环，我想看看循环中是否有下一个元素，这样我可以比较当前元素和下一个元素。我怎样才能做到这一点？我已经读过关于当前和下一个功能，但我不知道如何使用它们。

在此先感谢

独特的方法是将数组和然后是循环。这也适用于非数字索引数组：

  $ items = array（
'one'=> ;'two'，
'two'=>'two'，
'three'=>'three'
）; 
 $ backwards = array_reverse（$ items）; 
 $ last_item = NULL; （$ last_item === $ current_item）{
 //他们匹配
} 
 foreach（$ backwards as $ current_item） last_item = $ current_item; 
 
 
 
 $ b 
如果您仍然对使用 current 和下一个函数，您可以这样做： 
 
 
  $ items = array（'two'，'two'，'three'）; 
 $ length = count（$ items）; 
（$ i = 0; $ i <$ length  -  1; ++ $ i）{
 if（current（$ items）=== next（$ items））{
 /他们匹配
 
 
 $ / code $ / pre 
 
＃2可能是最好的解。注意， $ i< $ length  -  1; 将在比较数组中的最后两项后停止循环。我把这个放在循环中，以示例的方式明确。您应该计算 $ length = count（$ items） -  1;  
 
I have a foreach loop and I want to see if there is a next element in the loop so I can compare the current element with the next. How can I do this? I've read about the current and next functions but I can't figure out how to use them.

Thanks in advance
解决方案
A unique approach would be to reverse the array and then loop.  This will work for non-numerically indexed arrays as well:
$items = array(
    'one'   => 'two',
    'two'   => 'two',
    'three' => 'three'
);
$backwards = array_reverse($items);
$last_item = NULL;

foreach ($backwards as $current_item) {
    if ($last_item === $current_item) {
        // they match
    }
    $last_item = $current_item;
}
If you are still interested in using the current and next functions, you could do this:
$items = array('two', 'two', 'three');
$length = count($items);
for($i = 0; $i < $length - 1; ++$i) {
    if (current($items) === next($items)) {
        // they match
    }
}
#2 is probably the best solution.  Note, $i < $length - 1; will stop the loop after comparing the last two items in the array.  I put this in the loop to be explicit with the example.  You should probably just calculate $length = count($items) - 1;

                        
这篇关于获取foreach循环中的下一个元素的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！