Question

我想跳过一些foreach循环的迭代。

我有这段代码;

    $myarray = array("a","b","c","d","e","f","g","h");
    $skip = 5;
    foreach($myarray as $key => $letter){
        if($key < $skip){
            $key = $skip;
        }
        echo $letter;
    }

此代码不起作用。但有了它，我可以解释我想要什么。我实际上移动了下一次迭代的指针。它认为通过将密钥的值修改为我想要的那个就足够了。我知道可能的解决方案就是这个。

    $myarray = array("a","b","c","d","e","f","g","h");
    $skip = 5;
    foreach($myarray as $key => $letter){
        if($key < $skip){
            continue;
        }
        echo $letter;
    }

但是那种情况仍然是迭代步骤。我想完全跳过迭代。

由于

Answer 1

请参阅：array_slice

$myarray = array("a","b","c","d","e","f","g","h");
foreach(array_slice($myarray, 5) as $key => $letter){
    echo $letter;
}

Answer 2

您可以使用for循环

编辑：

for($i = $skip; $skip > 0, $i < count($myarray); $i++) {
   // do some stuff
}

Answer 3

这并不是foreach循环（以及一般的迭代）的工作方式。

你可以做continue版本（它工作正常;如果它是循环体中的第一件事，它基本上是相同的），或者你可以构造一个不同的数组来迭代不包括第一个元素，或者您可以使用常规for循环。

Answer 4

foreach (array_slice($myarray, 5) as $key => $letter) {
[...]
}

Answer 5

<?php

 $myarray = array("a","b","c","d","e","f","g","h");
    $skip = 5;
    $index = 0 ;
    foreach($myarray as $key => $letter){
        if( ($index % $skip) == 0 ){
           echo $letter;
        }       
        $index++;

    }

?>

Answer 6

$myarray = array("a","b","c","d","e","f","g","h");

foreach (new LimitIterator (new ArrayIterator ($myarray), 5) as $letter)
{
        echo $letter;
}

Answer 7

您可以$array->next()次致电$skip。有些情况下，您无法轻松使用常规for循环：例如，在迭代DatePeriod对象时。

在foreach期间跳过一些迭代

7 个答案: