Convert array of key-value pairs into associative array

Question

I currently have an Array:

[1] => Array
    (
        [0] => 100011
        [1] => 1
    )

[2] => Array
    (
        [0] => 100013
        [1] => 1
    )

[3] => Array
    (
        [0] => 100022
        [1] => 1
    )

[4] => Array
    (
        [0] => 100025
        [1] => 1

I want to take the first child item (meaning [0]) of each array (1,2,3,4,etc) and put it into a new array. I know I need to loop through and assign the value to new array. Just not sure how to do it.

End result would be:

$final (name of new array) has values 100013,100022,100025,etc.

My real end result:

I need it kept in the same order, because I am then going to use array array_combine ( array $keys , array $values ) to create 100013 as the key and 1 as the value, 100022 as the key, 1 as the value, 100025 as the key, 1 as the value.

If you know a quicker way to accomplish, it is appreciated.

Thanks.

array_column($arr, 0)

Ja͢ck
– Ja͢ck

2014-12-18 15:34:32 +00:00
Commented Dec 18, 2014 at 15:34 — Ja͢ck
– Ja͢ck, Commented Dec 18, 2014 at 15:34
@Ja͢ck genius. that did the trick.

LanterneRouge
– LanterneRouge

2014-12-18 15:40:32 +00:00
Commented Dec 18, 2014 at 15:40 — LanterneRouge
– LanterneRouge, Commented Dec 18, 2014 at 15:40

Ja͢ck · Accepted Answer · 2014-12-18 15:36:33Z

10

If I understand you right, the final result can be obtained by doing:

array_combine(array_column($arr, 0), array_column($arr, 1));

Or, in a more traditional way:

$result = [];
foreach ($arr as list($key, $value)) {
    $result[$key] = $value;
}

answered Dec 18, 2014 at 15:36

Ja͢ck

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2 Comments

Ryan Nghiem Over a year ago

hi @Jack, Did u test speed between two this way with a large array?

Ja͢ck Over a year ago

@RyanNghiem no, but i would imagine that the modern way uses more memory for sure!

Att3t · Accepted Answer · 2014-12-18 15:35:00Z

0

<?php
$results = array();
foreach($array as $item)
{
  $results[] = $item[0];
}
?>

answered Dec 18, 2014 at 15:35

Att3t

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Comments

A l w a y s S u n n y · Accepted Answer · 2014-12-18 16:05:07Z

0

if (PHP 5 >= 5.5.0)

 $first_names = array_column($records, 0);
 print '<pre>';
 print_r($first_names);

Another way,

function one_dimension($n) 
{
 return $n[0];
}

$result =array_map("one_dimension", $records);
print '<pre>';
print_r($result);

answered Dec 18, 2014 at 16:05

A l w a y s S u n n y

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