将多维 PHP 数组切分到其元素之一
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/163336/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Slicing a multi-dimensional PHP array across one of its elements
提问by gradbot
Say for example you just queried a database and you recieved this 2D array.
例如，假设您刚刚查询了一个数据库并收到了这个二维数组。
$results = array(
array('id' => 1, 'name' => 'red' , 'spin' => 1),
array('id' => 2, 'name' => 'green', 'spin' => -1),
array('id' => 3, 'name' => 'blue' , 'spin' => .5)
);
I often find myself writing loops like this.
我经常发现自己在写这样的循环。
foreach($results as $result)
$names[] = $result['name'];
My questions is does there exist a way to get this array $names without using a loop? Using callback functions count as using a loop.
我的问题是有没有办法在不使用循环的情况下获取这个数组 $names ？使用回调函数算作使用循环。
Here is a more generic example of getting every field.
这是获取每个字段的更通用示例。
foreach($results as $result)
foreach($result as $key => $value)
$fields[$key][] = $value;
回答by Salvador Dali
As of June 20th in PHP-5.5 there is a new function array_column
截至 6 月 20 日，PHP-5.5 中有一个新函数array_column
For example:
例如：
$records = array(
array(
'id' => 2135,
'first_name' => 'John',
'last_name' => 'Doe'
),
array(
'id' => 3245,
'first_name' => 'Sally',
'last_name' => 'Smith'
),
array(
'id' => 5342,
'first_name' => 'Jane',
'last_name' => 'Jones'
),
array(
'id' => 5623,
'first_name' => 'Peter',
'last_name' => 'Doe'
)
);
$firstNames = array_column($records, 'first_name');
print_r($firstNames);
Will return
将返回
Array
(
[0] => John
[1] => Sally
[2] => Jane
[3] => Peter
)
There are even more examples in the above mentioned link.
上面提到的链接中还有更多示例。
回答by inxilpro
I voted @Devon's response up because there really isn't a way to do what you're asking with a built-in function. The best you can do is write your own:
我对@Devon 的回答投了赞成票，因为真的没有办法用内置函数来完成你的要求。你能做的最好的事情就是自己写：
function array_column($array, $column)
{
$ret = array();
foreach ($array as $row) $ret[] = $row[$column];
return $ret;
}
回答by Alexey Petushkov
Starting PHP 5.3, you can use this pretty call with lambda function:
从 PHP 5.3 开始，您可以在 lambda 函数中使用这个漂亮的调用：
$names = array_map(function ($v){ return $v['name']; }, $results);
This will return array sliced by 'name' dimension.
这将返回按“名称”维度切片的数组。
回答by Devon
Simply put, no.
简单地说，没有。
You will need to use a loop or a callback function like array_walk.
您将需要使用循环或回调函数，如array_walk。
回答by gradbot
I did more research on this and found that ruby and prototype both have a function that does this called array_pluck,2. It's interesting that array_maphas a second use that allows you to do the inverse of what i want to do here. I also found a PHP classsomeone is writing to emulate prototypes manipulation of arrays.
我对此进行了更多研究，发现 ruby 和原型都有一个名为array_pluck, 2的函数。有趣的是，array_map它还有第二个用途，可以让您做与我在这里想做的相反的事情。我还发现有人正在编写一个 PHP类来模拟数组的原型操作。
I'm going to do some more digging around and if I don't find anything else I'll work on a patch to submit to the [email protected] mailing list and see if they will add array_pluck.
我将做更多的挖掘工作，如果我找不到其他任何东西，我将制作补丁以提交到 [email protected] 邮件列表，看看他们是否会添加 array_pluck。
回答by MirroredFate
For those of you that cannot upgrade to PHP5.5right now and need this function, here is an implementation of array_column.
对于那些PHP5.5现在无法升级并需要此功能的人，这里是array_column.
function array_column($array, $column){
$a2 = array();
array_map(function ($a1) use ($column, &$a2){
array_push($a2, $a1[$column]);
}, $array);
return $a2;
}
回答by JohnK
If you are running a version of PHP before 5.5 and array_column(), you can use the official replacement in plain PHP:
如果您运行的是 5.5 和 之前的 PHP 版本array_column()，则可以使用普通 PHP 中的官方替换：
回答by Keshav Kalra
This is fast function alternative of array_column()
这是 array_column() 的快速函数替代
if(!function_exists('array_column')) {
function array_column($element_name) {
$ele = array_map(function($element) {
return $element[$element_name];
}, $a);
return $ele;
}
}
回答by yokototo
You could do:
你可以这样做：
$tmp = array_flip($names);
$names = array_keys($tmp);
回答by Bill
I think this will do what you want
我认为这会做你想做的
You would have to do something like this
你将不得不做这样的事情
$results = array(
array('id' => 1, 'name' => 'red' , 'spin' => 1),
array('id' => 2, 'name' => 'green', 'spin' => -1),
array('id' => 3, 'name' => 'blue' , 'spin' => .5)
);
$name = array_uintersect_uassoc( $results, array('name' => 'value') , 0, "cmpKey");
print_r($name);
//////////////////////////////////////////////////
// FUNCTIONS
//////////////////////////////////////////////////
function cmpKey($key1, $key2) {
if ($key1 == $key2) {
return 0;
} else {
return -1;
}
}
However, I don't have access to PHP5 so I haven't tested this.
但是，我无法访问 PHP5，所以我还没有对此进行测试。
