How to convert a 1-dimensional array into a 2-dimensional array in PHP

Question

I have an array as follows:

$array['a'] = 'Red';
$array['b'] = 'Green';
$array['c'] = 'Blue';

I want to convert it to:

$array['a'][1] = 'Red';
$array['b'][1] = 'Green';
$array['c'][1] = 'Blue';

Is that possible with an existing PHP function or do I need to write my own function?

stackoverflow.com/questions/20728171/… stackoverflow.com/questions/18658475/… — JimmyBanks
– JimmyBanks, Commented Mar 25, 2014 at 16:12
maybe: array_walk($array, function(&$v, $k){ $v = array(1 => $v) }) — Mahakala
– Mahakala, Commented Mar 25, 2014 at 16:13

Amal · Accepted Answer · 2014-03-25 16:22:06Z

4

No, there is no built-in function that can achieve this. However, this is pretty straight-forward with a foreach loop, so I don't see why you need a function:

$result = array();

foreach ($array as $key => $value) {
    $result[$key][1] = $value;
}

print_r($result);

If you want a more functional approach, you could use array_walk():

// walks through the original $array and adds a new dimension
array_walk($array, function(&$v, $k){ 
    $v = array(1 => $v); 
});

Although, a normal foreach would be more straight-forward and readable.

edited Mar 25, 2014 at 16:22

answered Mar 25, 2014 at 16:11

Amal

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2 Comments

Hecksa Over a year ago

+1, though I'd add that the asker might want a function for code reuse purposes, or any of a number of other valid reasons.

Amal Over a year ago

@user1153551: And? That's the same as array in the OP's question :)

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