Is there a php function for generating associative array from indexed array

Question

Array
(
    [0] => '1 Fail'
    [1] => '2 Fail'
    [2] => '3 Pass'
    [3] => '4 Pass'
    [4] => '5 Pass'
)

Array
(
    ['1 Fail'] => '1 Fail'
    ['2 Fail'] => '2 Fail'
    ['3 Pass'] => '3 Pass'
    ['4 Pass'] => '4 Pass'
    ['5 Pass'] => '5 Pass'
)

Is there a php function to convert from array 1 to array 2

PS: I know this so i am looking for a built in function

foreach($result as $value)
{
    $assoc[$value] = $value;
}

You can swap keys and values, but I don't think there's a built-in function to copy values to their respective keys. — Michael Berkowski
– Michael Berkowski, Commented Dec 15, 2011 at 12:07
what's wrong with "this"? Why can't you browse array functions list yourself? — Your Common Sense
– Your Common Sense, Commented Dec 15, 2011 at 12:09
I won't think there is anything shorter than the four lines you already have. — ZeissS
– ZeissS, Commented Dec 15, 2011 at 12:09
This is a valid question., +1 PHP has built-ins for most any low-level array operation you could imagine. It's not at all unreasonable to expect there would be one for this, and to ask. — Michael Berkowski
– Michael Berkowski, Commented Dec 15, 2011 at 12:11

codaddict · Accepted Answer · 2011-12-15 12:09:49Z

5

Assuming all your array values are unique:

$assoc = array_combine(array_values($arr), array_values($arr));

answered Dec 15, 2011 at 12:09

codaddict

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1 Comment

aWebDeveloper Over a year ago

how different is ur approach from in terms of speed from @DaveRandom

DaveRandom · Accepted Answer · 2011-12-15 12:10:10Z

1

You could:

array_walk($array, function ($value, &$key) {
  $key = $value;
});

...but a more pertinent point is: why do you need to do this?

It seems like this is a very odd requirement, and whatever you need to do would be better done some other way...

answered Dec 15, 2011 at 12:10

DaveRandom

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2 Comments

aWebDeveloper Over a year ago

how different is ur approach from in terms of speed from @codaddict

DaveRandom Over a year ago

Unknown - probably depends very much on environment, PHP version and server configuration. It is unlikely to make any practical difference though, unless your array is ridiculously big. Premature optimisation is the root of all evil, apparently (although personally, I suspect Micro$oft)

JohnP · Accepted Answer · 2011-12-15 12:10:40Z

1

You can use array_combine

$arr    = array(
'1 fail',
'2 fail',
'3 fail',
'4 fail',
);
print_r(array_combine($arr, $arr));



Array
(
    [1 fail] => 1 fail
    [2 fail] => 2 fail
    [3 fail] => 3 fail
    [4 fail] => 4 fail
)

answered Dec 15, 2011 at 12:10

JohnP

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