How can I get the array of a single type from a multi dimensional array (without a loop)

Question

I have the following array $foo

array(10) {
[0] => array(4) {

["merchantId"] => string(5) "12e21"
["programId"] => string(27) "ddd3333"
["networkId"] => int(4)
["clientId"] => int(178)
}
[1] => array(4) {

["merchantId"] => string(5) "112e1"
["programId"] => string(27) "2vfrdbv1&=10&tmfdpid=csss"
["networkId"] => int(4)
["clientId"] => int(178)
}
[2] => array(4) {

["merchantId"] => string(5) "112e1"
["programId"] => string(27) "2vfrdbv1&=10&tmfdpid=csss"
["networkId"] => int(4)
["clientId"] => int(178)
}

And I need an array of clientId's (only)

Is it possible to access just the clientId to create an array of id's without a loop?

Something like:

$foo['clientId']; //which doesn't work

PHP 5.5's new array_column() function is used for precisely this purpose: There's a version of this function that can work with earlier versions available from https://github.com/ramsey/array_column — Mark Baker, Sep 13 '13 at 11:14

score 15 · Accepted Answer · edited Sep 13 '13 at 11:22

15

In PHP 5.5:

$rgResult = array_column($foo, 'clientId');

in PHP <=5.5:

$rgResult = array_map(function($rgItem)
{
  return $rgItem['clientId'];
}, $foo);

(put <= since this, of cause, will work in 5.5 too)

edited Sep 13 '13 at 11:22

Ashwini Agarwal

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answered Sep 13 '13 at 11:13

Alma Do

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@AlmaDoMundo - nothing I meant this please check it. http://stackoverflow.com/questions/19634429/how-to-truncate-this-and-make-it-a-link/19634528#19634528 – Sina R. Oct 28 '13 at 12:37
So what this question is to do with that? As do I? – Alma Do Oct 28 '13 at 12:39

score 0 · Answer 2 · answered Sep 13 '13 at 11:24

As an alternative to array_column()

$transpose = call_user_func_array(
    'array_map',
    array_merge(
        array(NULL),
        $data
    )
);
$result = $transpose[array_search("programId", array_keys($data[0]))];
var_dump($result);

Which can be done as a one-liner in PHP5.5

$result = call_user_func_array('array_map',array_merge(array(NULL),$data))[array_search("programId", array_keys($data[0]))];
var_dump($result);

I'll confess, it's not exactly intuitive or readable though

How can I get the array of a single type from a multi dimensional array (without a loop)

2 Answers2

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