php 在 foreach 循环中取消设置数组元素
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Unset array element inside a foreach loop
提问by Richard Knop
So here is my code:
所以这是我的代码：
<?php
$arr = array(array(2 => 5),
array(3 => 4),
array(7 => 10));
foreach ($arr as $v) {
$k = key($v);
if ($k > 5) {
// unset this element from $arr array
}
}
print_r($arr);
// now I would like to get the array without array(7 => 10) member
As you can see, I start with an array of single key => value arrays, I loop through this array and get a key of the current element (which is a single item array).
正如你所看到的，我从一个单键 => 值数组的数组开始，我遍历这个数组并获取当前元素的一个键（这是一个单项数组）。
I need to unset elements of the array with key higher than 5, how could I do that? I might also need to remove elements with value less than 50 or any other condition. Basically I need to be able to get a key of the current array item which is itself an array with a single item.
我需要取消设置键大于 5 的数组元素，我该怎么做？我可能还需要删除值小于 50 或任何其他条件的元素。基本上我需要能够获得当前数组项的键，它本身就是一个包含单个项的数组。
回答by sasa
foreach($arr as $k => $v) {
if(key($v) > 5) {
unset($arr[$k]);
}
}
回答by Alexander Konstantinov
It issafe in PHP to remove elements from an array while iterating over it using foreach loop:
它是在PHP安全，而使用foreach循环在它迭代从数组中删除元素：
foreach ($arr as $key => $value) {
if (key($value) > 5) {
unset($arr[$key]);
}
}
回答by Amber
回答by Robert McBean
It's not really safe to add or delete from a collection while iterating through it. How about adding the elements you want to a second array, then dumping the original?
在遍历集合时添加或删除集合并不是真正安全的。将您想要的元素添加到第二个数组中，然后转储原始元素如何？
回答by Rabesh Lal Shrestha
To unset array element we Used unset() and php function like below:
要取消设置数组元素，我们使用了 unset() 和 php 函数，如下所示：
foreach($array as $key=>$value)
{
if(key($value) > 5)
{
unset($array[$key]);
}
}
