Multidimensional array to single array in PHP

Question

I am working in PHP so I have an array like this, from this array I want filter take user_id to another array like I given below.

Array
(
    [0] => Array
        (
            [user_id] => 66
            [distance] => 0
        )

    [1] => Array
        (
            [user_id] => 68
            [distance] => 0
        )

    [2] => Array
        (
            [user_id] => 81
            [distance] => 0
        )

    [3] => Array
        (
            [user_id] => 65
            [distance] => 0.00010218008081861118
        )

)

I want an array like this,

$user_id=array(66,68,81,65);

Ataur Rahman · Accepted Answer · 2018-02-03 04:35:57Z

6

Use array_column()

Returns an array of values representing a single column from the input array.

<?php

$user_array = array(
                  0 => array('user_id' => 1, 'name' => 'Bob'),
                  1 => array('user_id' => 2, 'name' => 'John'),
                  2 => array('user_id' => 3, 'name' => 'Mary')
              );

$users = array_column($user_array, 'user_id');

print_r($users);

Output :

Array
(
   [0] => 1
   [1] => 2
   [2] => 3
)

edited Feb 3, 2018 at 4:35

answered Feb 3, 2018 at 4:32

Ataur Rahman

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2 Comments

Alex Over a year ago

Learn something new everyday! Didn't even know this function existed.

Ataur Rahman Over a year ago

That's the beauty of programming, always discovering new things. ^_^

Alex · Accepted Answer · 2018-02-03 04:28:36Z

5

Where $array is the multidimensional array you provided above:

$data = array();
foreach ($array as $item) {
    $data[] = $item['user_id'];
}
print_r($data);

answered Feb 3, 2018 at 4:28

Alex

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