In associative array, how to make the first element of each array element a key

Question

Array(
 [0] => Array
        (
            [0] => 2017-10-05
            [1] => 24,57
            [2] => 24,65
            [3] => 23,86
        )

    [2] => Array
        (
            [0] => 2017-10-04
            [1] => 24,38
            [2] => 24,675
            [3]=> 24,24
        )
   )

I want to convert this into

Array(
 [2017-10-05] => Array
        (

            [0] => 24,57
            [1] => 24,65
            [2] => 23,86
        )

    [2017-10-04] => Array
        ( 
            [0] => 24,38
            [1] => 24,675
            [2] => 24,24
        )

This question similar to How to make array first value as key for the second value as value in php array. But i can't use array_column in my case,

Tomasz W. · Accepted Answer · 2017-10-07 14:44:38Z

6

You can use this code with array_slice:

$newArray = [];
foreach($array as $a) {
    $newArray[$a[0]] = array_slice($a, 1); 
}

DEMO

edited Oct 7, 2017 at 14:44

answered Oct 7, 2017 at 14:38

Tomasz W.

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5 Comments

beginner Over a year ago

Good Solution, I am trying to do this with array_walk, But i think this is better and simpler , Thanks

Tomasz W. Over a year ago

Glad to hear that. Welcome.

beginner Over a year ago

Btw another version of this would be $newArray = []; foreach($array as $a) { $first_ele = array_shift($a); $newArray[$first_ele] = $a;} `

Tomasz W. Over a year ago

Yeah, I would even shorten it by one line foreach($array as $a) { $newArray[array_shift($a)] = $a;}

Progrock Over a year ago

And if golfing, do away with the curlies.

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