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) \"ffffd3333\"
[\"         


        

Answer 1

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

Answer 2

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)