(PHP 5 >= 5.5.0, PHP 7, PHP 8)
array_column — 返回输入数组中指定列的值
array_column() 返回
array 中键名为
column_key 的一列值。 如果指定了可选参数
index_key，则使用输入数组中
index_key 列的值将作为返回数组中对应值的键。
array多维数组或对象数组，从中提取一列值。 如果提供的是对象数组，只有 public 的属性会被直接取出。 如果想取出 private 和 protected 的属性，类必须实现 __get() 和 __isset() 魔术方法。
column_key
需要返回值的列。它可以是索引数组的列索引，或者是关联数组的列的键，也可以是属性名。
也可以是 null ，此时将返回整个数组（配合
index_key 参数来重新索引数组时非常好用）。
index_key作为返回数组的索引/键的列。它可以是该列的整数索引，或者字符串键值。 该值会像数组键一样被 强制转换 （但是，在 PHP 8.0.0 之前，也被允许支持转换为字符串对象）。
返回输入数组中单列值的数组。
示例 #1 从结果集中取出 first_name 列
<?php
// 表示从数据库返回的记录集的数组
$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',
)
);
$first_names = array_column($records, 'first_name');
print_r($first_names);
?>以上示例会输出：
Array
(
[0] => John
[1] => Sally
[2] => Jane
[3] => Peter
)
示例 #2 从结果集中总取出 last_name 列，用相应的“id”作为键值
<?php
// 使用示例 #1 中的 $records 数组
$last_names = array_column($records, 'last_name', 'id');
print_r($last_names);
?>以上示例会输出：
Array
(
[2135] => Doe
[3245] => Smith
[5342] => Jones
[5623] => Doe
)
示例 #3 username 列是从对象获取 public 的 "username" 属性
<?php
class User
{
public $username;
public function __construct(string $username)
{
$this->username = $username;
}
}
$users = [
new User('user 1'),
new User('user 2'),
new User('user 3'),
];
print_r(array_column($users, 'username'));
?>以上示例会输出：
Array
(
[0] => user 1
[1] => user 2
[2] => user 3
)
示例 #4 通过 __get() 魔术方法从对象中获取 private 属性的 "name" 列。
<?php
class Person
{
private $name;
public function __construct(string $name)
{
$this->name = $name;
}
public function __get($prop)
{
return $this->$prop;
}
public function __isset($prop) : bool
{
return isset($this->$prop);
}
}
$people = [
new Person('Fred'),
new Person('Jane'),
new Person('John'),
];
print_r(array_column($people, 'name'));
?>以上示例会输出：
Array
(
[0] => Fred
[1] => Jane
[2] => John
)
if array_column does not exist the below solution will work.
if(!function_exists("array_column"))
{
function array_column($array,$column_name)
{
return array_map(function($element) use($column_name){return $element[$column_name];}, $array);
}
}You can also use array_map fucntion if you haven't array_column().
example:
$a = array(
array(
'id' => 2135,
'first_name' => 'John',
'last_name' => 'Doe',
),
array(
'id' => 3245,
'first_name' => 'Sally',
'last_name' => 'Smith',
)
);
array_column($a, 'last_name');
becomes
array_map(function($element){return $element['last_name'];}, $a);This function does not preserve the original keys of the array (when not providing an index_key).
You can work around that like so:
<?php
// instead of
array_column($array, 'column');
// to preserve keys
array_combine(array_keys($array), array_column($array, 'column'));
?>Please note that if you use array_column to reset the index, when the index value is null, there will be different results in different PHP versions, examples
<?php
$array = [
[
'name' =>'Bob',
'house' =>'big',
],
[
'name' =>'Alice',
'house' =>'small',
],
[
'name' =>'Jack',
'house' => null,
],
];
var_dump(array_column($array,null,'house'));
On 5.6.30, 7.0.0, 7.2.0 (not limited to) get the following results
array(3) {
["big"]=>
array(2) {
["name"]=>
string(3) "Bob"
["house"]=>
string(3) "big"
}
["small"]=>
array(2) {
["name"]=>
string(5) "Alice"
["house"]=>
string(5) "small"
}
[0]=>
array(2) {
["name"]=>
string(4) "Jack"
["house"]=>
NULL
}
}
The new index, null will be converted to int, and can be incremented according to the previous index, that is, if Alice "house" is also null, then Alice's new index is "0", Jack's new index is "1"
On 7.1.21, 7.2.18, 7.4.8 (not limited to) will get the following results
array(3) {
["Big"]=>
array(2) {
["name"]=>
string(3) "Bob"
["house"]=>
string(3) "Big"
}
["small"]=>
array(2) {
["name"]=>
string(5) "Alice"
["house"]=>
string(5) "small"
}
[""]=>
array(2) {
["name"]=>
string(4) "Jack"
["house"]=>
NULL
}
}
The new index null will be converted to an empty stringSome remarks not included in the official documentation.
1) array_column does not support 1D arrays, in which case an empty array is returned.
2) The $column_key is zero-based.
3) If $column_key extends the valid index range an empty array is returned.Array multiple columns:
<?php
function array_columns() {
$args = func_get_args();
$array = array_shift($args);
if (!$args) {
return $array;
}
$keys = array_flip($args);
return array_map(function($element) use($keys) {
return array_intersect_key($element, $keys);
}, $array);
}
?>
EXAMPLE:
<?php
$products = [
[
'id' => 2,
'name' => 'Phone',
'price' => 210.3
],
[
'id' => 3,
'name' => 'Laptop',
'price' => 430.12
]
];
print_r(array_columns($products, 'name', 'price'));
?>
Output:
Array
(
[0] => Array
(
[name] => Phone
[price] => 210.3
)
[1] => Array
(
[name] => Laptop
[price] => 430.12
)
)array_column implementation that works on multidimensional arrays (not just 2-dimensional):
<?php
function array_column_recursive(array $haystack, $needle) {
$found = [];
array_walk_recursive($haystack, function($value, $key) use (&$found, $needle) {
if ($key == $needle)
$found[] = $value;
});
return $found;
}
Taken from https://github.com/NinoSkopac/array_column_recursiveBecause the function was not available in my version of PHP, I wrote my own version and extended it a little based on my needs.
When you give an $indexkey value of -1 it preserves the associated array key values.
EXAMPLE:
$sample = array(
'test1' => array(
'val1' = 10,
'val2' = 100
),
'test2' => array(
'val1' = 20,
'val2' = 200
),
'test3' => array(
'val1' = 30,
'val2' = 300
)
);
print_r(array_column_ext($sample,'val1'));
OUTPUT:
Array
(
[0] => 10
[1] => 20
[2] => 30
)
print_r(array_column_ext($sample,'val1',-1));
OUTPUT:
Array
(
['test1'] => 10
['test2'] => 20
['test3'] => 30
)
print_r(array_column_ext($sample,'val1','val2'));
OUTPUT:
Array
(
[100] => 10
[200] => 20
[300] => 30
)
<?php
function array_column_ext($array, $columnkey, $indexkey = null) {
$result = array();
foreach ($array as $subarray => $value) {
if (array_key_exists($columnkey,$value)) { $val = $array[$subarray][$columnkey]; }
else if ($columnkey === null) { $val = $value; }
else { continue; }
if ($indexkey === null) { $result[] = $val; }
elseif ($indexkey == -1 || array_key_exists($indexkey,$value)) {
$result[($indexkey == -1)?$subarray:$array[$subarray][$indexkey]] = $val;
}
}
return $result;
}
?>The counterpart of array_column(), namely create an array from columns, can be done with array_map() :
<?php
// Columns
$lastnames = ['Skywalker', 'Organa', 'Kenobi'];
$firstnames = ['Luke', 'Leia', 'Obiwan'];
// Columns to array
$characters = array_map(
fn ($l, $f) => ['lastname' => $l, 'firstname' => $f],
$lastnames, $firstnames
);
print_r($characters);
/*
[
0 => ['lastname' => 'Skywalker', 'firstname' => 'Luke']
1 => ['lastname' => 'Organa', 'firstname' => 'Leia']
2 => ['lastname' => 'Kenobi', 'firstname' => 'Obiwan']
]
*/<?php
# for PHP < 5.5
# AND it works with arrayObject AND array of objects
if (!function_exists('array_column')) {
function array_column($array, $columnKey, $indexKey = null)
{
$result = array();
foreach ($array as $subArray) {
if (is_null($indexKey) && array_key_exists($columnKey, $subArray)) {
$result[] = is_object($subArray)?$subArray->$columnKey: $subArray[$columnKey];
} elseif (array_key_exists($indexKey, $subArray)) {
if (is_null($columnKey)) {
$index = is_object($subArray)?$subArray->$indexKey: $subArray[$indexKey];
$result[$index] = $subArray;
} elseif (array_key_exists($columnKey, $subArray)) {
$index = is_object($subArray)?$subArray->$indexKey: $subArray[$indexKey];
$result[$index] = is_object($subArray)?$subArray->$columnKey: $subArray[$columnKey];
}
}
}
return $result;
}
}
?>Here's a neat little snippet for filtering a set of records based on a the value of a column:
<?php
function dictionaryFilterList(array $source, array $data, string $column) : array
{
$new = array_column($data, $column);
$keep = array_diff($new, $source);
return array_intersect_key($data, $keep);
}
// Usage:
$users = [
['first_name' => 'Jed', 'last_name' => 'Lopez'],
['first_name' => 'Carlos', 'last_name' => 'Granados'],
['first_name' => 'Dirty', 'last_name' => 'Diana'],
['first_name' => 'John', 'last_name' => 'Williams'],
['first_name' => 'Betty', 'last_name' => 'Boop'],
['first_name' => 'Dan', 'last_name' => 'Daniels'],
['first_name' => 'Britt', 'last_name' => 'Anderson'],
['first_name' => 'Will', 'last_name' => 'Smith'],
['first_name' => 'Magic', 'last_name' => 'Johnson'],
];
var_dump(dictionaryFilterList(['Dirty', 'Dan'], $users, 'first_name'));
// Outputs:
[
['first_name' => 'Jed', 'last_name' => 'Lopez'],
['first_name' => 'Carlos', 'last_name' => 'Granados'],
['first_name' => 'John', 'last_name' => 'Williams'],
['first_name' => 'Betty', 'last_name' => 'Boop'],
['first_name' => 'Britt', 'last_name' => 'Anderson'],
['first_name' => 'Will', 'last_name' => 'Smith'],
['first_name' => 'Magic', 'last_name' => 'Johnson']
]
?>I added a little more functionality to the more popular answers here to support the $index_key parameter for PHP < 5.5
<?php
// for php < 5.5
if (!function_exists('array_column')) {
function array_column($input, $column_key, $index_key = null) {
$arr = array_map(function($d) use ($column_key, $index_key) {
if (!isset($d[$column_key])) {
return null;
}
if ($index_key !== null) {
return array($d[$index_key] => $d[$column_key]);
}
return $d[$column_key];
}, $input);
if ($index_key !== null) {
$tmp = array();
foreach ($arr as $ar) {
$tmp[key($ar)] = current($ar);
}
$arr = $tmp;
}
return $arr;
}
}
?>Note that this function will return the last entry when possible keys are duplicated.
<?php
$array = array(
array(
'1-1',
'one',
'one',
),
array(
'1-2',
'two',
'one',
),
);
var_dump(array_column($array, $value = 0, $index = 1));
var_dump(array_column($array, $value = 0, $index = 2));
// returns:
/*
array (size=2)
'one' => string '1-1' (length=3)
'two' => string '1-2' (length=3)
array (size=1)
'one' => string '1-2' (length=3)
*/
?>//php < 5.5
if(function_exists('array_column'))
{
function array_column($arr_data, $col)
{
$result = array_map(function($arr){return $arr[$col]}, $arr_data);
return $result;
}
}My version is closer to the original than http://github.com/ramsey/array_column
<?php
/**
* Provides functionality for array_column() to projects using PHP earlier than
* version 5.5.
* @copyright (c) 2015 WinterSilence (http://github.com/WinterSilence)
* @license MIT
*/
if (!function_exists('array_column')) {
/**
* Returns an array of values representing a single column from the input
* array.
* @param array $array A multi-dimensional array from which to pull a
* column of values.
* @param mixed $columnKey The column of values to return. This value may
* be the integer key of the column you wish to retrieve, or it may be
* the string key name for an associative array. It may also be NULL to
* return complete arrays (useful together with index_key to reindex
* the array).
* @param mixed $indexKey The column to use as the index/keys for the
* returned array. This value may be the integer key of the column, or
* it may be the string key name.
* @return array
*/
function array_column(array $array, $columnKey, $indexKey = null)
{
$result = array();
foreach ($array as $subArray) {
if (!is_array($subArray)) {
continue;
} elseif (is_null($indexKey) && array_key_exists($columnKey, $subArray)) {
$result[] = $subArray[$columnKey];
} elseif (array_key_exists($indexKey, $subArray)) {
if (is_null($columnKey)) {
$result[$subArray[$indexKey]] = $subArray;
} elseif (array_key_exists($columnKey, $subArray)) {
$result[$subArray[$indexKey]] = $subArray[$columnKey];
}
}
}
return $result;
}
}
?>If you want to preserve the array keys AND you want it to work on both object properties and array elements AND you want it to work if some of the arrays/objects in the array do not have the given key/property defined, basically the most ROBUST version you can get, yet quick enough:
<?php
function array_column_keys(array|ArrayAccess $arr, string $col) {
// like array_columns but keeps the keys
//to make it work for objects and arrays
return array_map(fn($e) => (is_countable($e) ? ($e[$col]??null) : null) ?: (is_object($e) ? $e->$col : null), $arr);
}
?>
If a key/property is undefined, the value in the result array will be NULL. You can use array_filter() to filter those out if needed.
<?php
class a {
public string $a = 'property a';
public string $b = 'property b';
}
$a1 = new a;
$a2 = new a;
$a2->a = 'plop';
$b = ['one'=> ['a'=>'plop'],
3 => $a1,
4 => $a2,
5 =>[],
'kud'=>new a];
return array_column_keys($b, 'a');
?>
Returns:
Array
(
[one] => plop
[3] => property a
[4] => something else
[5] =>
[kud] => property a
)Index_key is safely applicable only in cases when corresponding values of this index are unique through over the array. Otherwise only the latest element of the array with the same index_key value will be picked up.
<?php
$records = array(
array(
'id' => 2135,
'first_name' => 'John',
'last_name' => 'Doe',
'company_id' => 1,
),
array(
'id' => 3245,
'first_name' => 'Sally',
'last_name' => 'Smith',
'company_id' => 1,
),
array(
'id' => 5342,
'first_name' => 'Jane',
'last_name' => 'Jones',
'company_id' => 1,
),
array(
'id' => 5623,
'first_name' => 'Peter',
'last_name' => 'Doe',
'company_id' => 2,
)
);
$first_names = array_column($records, 'first_name', 'company_id');
print_r($first_names);
?>
The above example will output:
<?php
Array
(
[1] => Jane
[2] => Peter
)
?>
To group values by the same `index_key` in arrays one can use simple replacement for the `array_column` like below example function:
<?php
function arrayed_column(array $array, int|string $column_key, int|string $index_key) {
$output = [];
foreach ($array as $item) {
$output[$item['index_key']][] = $item['column_key'];
}
return $output;
}
$first_names = arrayed_column($records, 'first_name', 'company_id');
print_r($first_names);
?>
The output:
<?php
Array
(
[1] => Array
(
[0] => John
[1] => Sally
[2] => Jane
)
[2] => Array
(
[0] =>Peter
)
)
?>If an entry in the source array does not have a column_key element then array_column will silently skip that entry and return an array shorter than the source.
If entries can't be uniquely identified by an index_key then there's no way of telling which ones were skipped, as without an index_key array_column returns a plain list.
<?php
$array = [
['a' => '0th', 'b' => 'zero'],
['a' => '1st', 'b' => 'one'],
['a' => '2nd' /* oops */],
['a' => '3rd', 'b'=>'three']];
var_export(array_column($array, 'b'));
var_export(array_column($array, 'b', 'a'));
?>The following function may be useful to create columns from all values of indexed arrays:
<?php
function array_column_all(array $arrays): array
{
$output = [];
$columnCount = count($arrays[0]);
for ($i = 0; $i < $columnCount; $i++)
{
$output [] = array_column($arrays, $i);
}
return $output;
}
?>
Use:
-----
<?php
array_column_all(
[
['A1', 'A2', 'A3'],
['B1', 'B2', 'B3'],
['C1', 'C2', 'C3'],
]
);
?>
This will output:
-------------------
Array
(
[0] => Array
(
[0] => A1
[1] => B1
[2] => C1
)
[1] => Array
(
[0] => A2
[1] => B2
[2] => C2
)
[2] => Array
(
[0] => A3
[1] => B3
[2] => C3
)
)if (!function_exists('array_column'))
{
function array_column($input, $column_key=null, $index_key=null)
{
$result = array();
$i = 0;
foreach ($input as $v)
{
$k = $index_key === null || !isset($v[$index_key]) ? $i++ : $v[$index_key];
$result[$k] = $column_key === null ? $v : (isset($v[$column_key]) ? $v[$column_key] : null);
}
return $result;
}
}a simple solution:
function arrayColumn(array $array, $column_key, $index_key=null){
if(function_exists('array_column ')){
return array_column($array, $column_key, $index_key);
}
$result = [];
foreach($array as $arr){
if(!is_array($arr)) continue;
if(is_null($column_key)){
$value = $arr;
}else{
$value = $arr[$column_key];
}
if(!is_null($index_key)){
$key = $arr[$index_key];
$result[$key] = $value;
}else{
$result[] = $value;
}
}
return $result;
}If you need to extract more than one column from an array, you can use array_intersect_key on each element, like so:
function array_column_multi(array $input, array $column_keys) {
$result = array();
$column_keys = array_flip($column_keys);
foreach($input as $key => $el) {
$result[$key] = array_intersect_key($el, $column_keys);
}
return $result;
}array_column() will return duplicate values.
Instead of having to use array_unique(), use the $index_key as a hack.
**Caution: This may get messy when setting the $column_key and/or $index_key as integers.**
<?php
$records = [
[ 'id' => 2135, 'first_name' => 'John' ],
[ 'id' => 3245, 'first_name' => 'Sally' ],
[ 'id' => 5342, 'first_name' => 'Jane' ],
[ 'id' => 5623, 'first_name' => 'Peter' ],
[ 'id' => 6982, 'first_name' => 'Sally' ]
];
print_r(array_unique(array_column($records, 'first_name')));
// Force uniqueness by making the key the value.
print_r(array_column($records, 'first_name', 'first_name'));
print_r(array_column($records, 'id', 'first_name'));
// Returns
/*
Array
(
[0] => John
[1] => Sally
[2] => Jane
[3] => Peter
)
Array
(
[John] => John
[Sally] => Sally
[Jane] => Jane
[Peter] => Peter
)
Array
(
[John] => 2135
[Sally] => 6982
[Jane] => 5342
[Peter] => 5623
)
*/
?>If array_column is not available you can use the following function, which also has the $index_key parameter:
if (!function_exists('array_column')) {
function array_column($array, $column_key, $index_key = null)
{
return array_reduce($array, function ($result, $item) use ($column_key, $index_key)
{
if (null === $index_key) {
$result[] = $item[$column_key];
} else {
$result[$item[$index_key]] = $item[$column_key];
}
return $result;
}, []);
}
}If you want to rearrage an array with two layers (perhaps from database-requests), then use 'array_walk' instead:
<?php
$yamlList = [
['title' => 'hallo ich', 'identifier' => 'ich', 'Klaus'=> 'doof',],
['title' => 'hallo du', 'identifier' => 'du', 'Klaus'=> 'doof',],
['title' => 'hallo er', 'identifier' => 'er', 'Klaus'=> 'doof',],
];
echo ('Input'."\n".print_r($yamlList,true)."\n");
array_walk($yamlList, function (&$value, $key) {
$value = [
$value['title'],
$value['identifier'],
];
});
echo ("\n".'Output'."\n".print_r($yamlList,true)."\n");
?>
The Result
===========
...
Output
Array
(
[0] => Array
(
[0] => hallo ich
[1] => ich
)
[1] => Array
(
[0] => hallo du
[1] => du
)
[2] => Array
(
[0] => hallo er
[1] => er
)
)