How to set php array index as array value...? - php

Question

I have this array from a query.
Array
(
[0] => Array
(
[user_id] => 5
[first_name] => Diyaa
[profile_pic] => profile/user5.png
)
[1] => Array
(
[user_id] => 8
[first_name] => Raj
[profile_pic] => profile/user8.jpg
)
[2] => Array
(
[user_id] => 10
[first_name] => Vanathi
[profile_pic] => profile/user10.jpg
)
)
I need to set array index as like array value (user_id) as given below:
Array
(
[5] => Array
(
[user_id] => 5
[first_name] => Diyaa
[profile_pic] => profile/user5.png
)
[8] => Array
(
[user_id] => 8
[first_name] => Raj
[profile_pic] => profile/user8.jpg
)
[10] => Array
(
[user_id] => 10
[first_name] => Vanathi
[profile_pic] => profile/user10.jpg
)
)
Note: user_id is an unique value, it won't repeat again. No need to worry about index value.
How to convert and get that array as specified index value..?

Answer 1

This is exactly what array_column() is for:
$result = array_column($array, null, 'user_id');
array_column() returns the values from a single column of the input, identified by the column_key. Optionally, an index_key may be provided to index the values in the returned array by the values from the index_key column of the input array.
column_key
The column of values to return. This value may be an integer key of the column you wish to retrieve, or it may be a string key name for an associative array or property name. It may also be NULL to return complete arrays or objects (this is useful together with index_key to reindex the array).

Answer 2

You can try this code, here I do some extra work. Refer to AbraCadaver's clever answer $result = array_column($array, null, 'user_id');.
array_combine(array_column($array, 'user_id'), $array);

Answer 3

Both structures are unnecessarily complex and redundant. Why not
$foo = array(5 =>
array('first_name' => 'Diyaa',
'profile_pic' => 'profile/user5.png'),
8 =>
array('first_name' => 'Raj',
'profile_pic' => 'profile/user8.png'),
...
);
Then access it via $foo[$user_id], which will give you a 2-element associative array such as
array('first_name' => 'Raj',
'profile_pic' => 'profile/user8.png'),
For changing a profile_pic:
$foo[$user_id]['profile_pic'] = $new_pic;