PHP extract values from multidimensional array without a loop

Question

I'm just wondering if it's possible to extract values from an array, in PHP, without having to loop through. Here's part of my array so you know what I mean;

Array
(
[0] => Array
    (
        [0] => 76
        [1] => Adventures of Huckleberry Finn
    )

[1] => Array
    (
        [0] => 65
        [1] => Adventures of Huckleberry Finn
    )

[2] => Array
    (
        [0] => 59
        [1] => Bookcases
    )
)

I'm after the integer [0] from each array - is there a function that can do this quicker than a foreach loop (the way I normally do this) ?

Thanks.

I need an array with just the numbers in, so array(76, 65, 59) — Dan, Apr 05 '13 at 23:01

score 10 · Answer 1 · edited Jan 15 '23 at 03:27

10

Sure you are looking for the array_column function.

$newArray = array_column($originalArray,'0');

As said in PHP Manual, with this function you can extract, from an array of arrays, the only information you need. It is normally used with Associative arrays, but you can use a number as parameter and it will work as well.

edited Jan 15 '23 at 03:27

ericek111

575
7
15

answered Feb 23 '16 at 15:30

Liz

123
1
6

score 1 · Answer 2 · answered Apr 05 '13 at 23:43

Go for a clear loop, your fellow coders will thank you. It's probably about as fast of faster then any other solution, and clear cut code is preferable over obscure loop-dodging.

Just as an illustration: how many seconds would it take you to see what:

list($b) = call_user_func_array('array_map',array_merge(array(null),$a));

...does?

Does the trick. Don't use it.

score 0 · Answer 3 · answered Apr 05 '13 at 23:00

0

You eventually mean array_walk ... but this also some sort of loop? Then: the answer is no.

And I don't think that there is any quicker method (except from writing your own extension in C :-P)

answered Apr 05 '13 at 23:00

bwoebi

23,637
5
58
79

I'm just looking at array_walk now. My desired output is array(76, 65, 59) - will array_walk do this? – Dan Apr 05 '13 at 23:05
see this answer: http://stackoverflow.com/questions/15844965/php-extract-values-from-multidimensional-array-without-a-loop/#answer-15845034 ;) – bwoebi Apr 05 '13 at 23:07

score 0 · Answer 4 · answered Apr 05 '13 at 23:05

0

Try:

array_walk($array, function(&$v) { $v = $v[0]; });

That should convert the array into the format you want.

answered Apr 05 '13 at 23:05

Michael Thessel

706
5
20

What is finally the same as: `foreach ($array as &$v) $v = $v[0];` – bwoebi Apr 05 '13 at 23:09
Sure, he asked for a way to do it without foreach though. `array_walk` has the advantage that `$v` doesn't pollute the name space. – Michael Thessel Apr 05 '13 at 23:14

score 0 · Answer 5 · answered Apr 05 '13 at 23:10

0

You would probably be looking for array_walk()

$newArray = array();
$myCallback = function($key) use(&$newArray){
  $newArray[] = $key[0];
};

array_walk($myArray, $myCallback);

This would be of course if you had your array above in variable $myArray

answered Apr 05 '13 at 23:10

Zeffr

9
1

I just tested this and it worked perfectly setting `$newArray` with the values you require. – Peter Featherstone Apr 05 '13 at 23:36

PHP extract values from multidimensional array without a loop

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