获取 PHP 数组中的最后一个键值对
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Get last key-value pair in PHP array
提问by greenbandit
I have an array that is structured like this:
我有一个结构如下的数组:
[33] => Array
(
[time] => 1285571561
[user] => test0
)
[34] => Array
(
[time] => 1285571659
[user] => test1
)
[35] => Array
(
[time] => 1285571682
[user] => test2
)
How can I get the last value in the array, but maintaining the index [35]?
如何获取数组中的最后一个值,但保持索引 [35]?
The outcome that I am looking for is this:
我正在寻找的结果是这样的:
[35] => Array
(
[time] => 1285571682
[user] => test2
)
回答by Alex Pliutau
try to use
尝试使用
end($array);
回答by salathe
$last = array_slice($array, -1, 1, true);
See http://php.net/array_slicefor details on what the arguments mean.
有关参数含义的详细信息,请参阅http://php.net/array_slice。
P.S. Unlike the other answers, this one actually does what you want. :-)
PS 与其他答案不同,这个答案实际上可以满足您的需求。:-)
回答by Gumbo
You can use end
to advance the internal pointer to the end or array_slice
to get an array only containing the last element:
您可以使用end
将内部指针推进到末尾或array_slice
获取仅包含最后一个元素的数组:
$last = end($arr);
$last = current(array_slice($arr, -1));
回答by Govinda Yadav
If you have an array
如果你有一个数组
$last_element = array_pop(array);
回答by Ali
Example 1:
示例 1:
$arr = array("a"=>"a", "5"=>"b", "c", "key"=>"d", "lastkey"=>"e");
print_r(end($arr));
Output= e
输出= e
Example 2:
示例 2:
ARRAY withoutkey(s)
没有键的数组
$arr = array("a", "b", "c", "d", "e");
print_r(array_slice($arr, -1, 1, true));
// output is = array( [4] => e )
Example 3:
示例 3:
ARRAY withkey(s)
带键的数组
$arr = array("a"=>"a", "5"=>"b", "c", "key"=>"d", "lastkey"=>"e");
print_r(array_slice($arr, -1, 1, true));
// output is = array ( [lastkey] => e )
Example 4:
示例 4:
If your array keys like : [0] [1] [2] [3] [4] ... etc. You can use this:
如果你的数组键像:[0] [1] [2] [3] [4] ...等,你可以使用这个:
$arr = array("a","b","c","d","e");
$lastindex = count($arr)-1;
print_r($lastindex);
Output= 4
输出= 4
Example 5:But if you are not sure!
示例 5:但如果您不确定!
$arr = array("a"=>"a", "5"=>"b", "c", "key"=>"d", "lastkey"=>"e");
$ar_k = array_keys($arr);
$lastindex = $ar_k [ count($ar_k) - 1 ];
print_r($lastindex);
Output= lastkey
输出= 最后一个键
Resources:
资源:
回答by ipalaus
Like said Gumbo,
就像秋葵说的,
<?php
$fruits = array('apple', 'banana', 'cranberry');
echo end($fruits); // cranberry
?>
回答by Yas
Another solution cold be:
另一个解决方案冷是:
$value = $arr[count($arr) - 1];
The above will count the amount of array values, substract 1 and then return the value.
以上将计算数组值的数量,减去1然后返回值。
Note: This can only be used if your array keys are numeric.
注意:这只能在您的数组键是数字时使用。
回答by jmary
As the key is needed, the accepted solution doesn't work.
由于需要密钥,接受的解决方案不起作用。
This:
这个:
end($array);
return array(key($array) => array_pop($array));
will return exactly as the example in the question.
将完全按照问题中的示例返回。
回答by voodoo417
"SPL-way"
:
"SPL-way"
:
$splArray = SplFixedArray::fromArray($array);
$last_item_with_preserved_index[$splArray->getSize()-1] = $splArray->offsetGet($splArray->getSize()-1);
Read more about SplFixedArray
and why it's in some cases ( especially with big-index sizes array-data) more preferable than basic array
here => The SplFixedArray class.
在这里阅读更多关于SplFixedArray
它以及为什么它在某些情况下(尤其是大索引大小的数组数据)比基本更可取的array
地方 => SplFixedArray 类。