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[Edit] From multidimensional array to single dimension

Example

$array = array(
    array(
        'id' => '1',
        'name' => 'Scott',
        'email' => '[email protected]'
    ),
    array(
        'id' => '4',
        'name' => 'John',
        'email' => '[email protected]'
    ),
    array(
        'id' => '56',
        'name' => 'Chris',
        'email' => '[email protected]'
    )
);

print_r(array_pivot($array, 'id', 'name'));
/*
Array
(
    [1] => Scott
    [4] => John
    [56] => Chris
)
*/
print_r(array_pivot($array, null, 'email'));
/*
Array
(
    [0] => [email protected]
    [1] => [email protected]
    [2] => [email protected]
)
*/
Save 9,071 array_pivot 
function array_pivot($array, $key, $value) {
    if(!is_array($array))
        return false;
    if(count($array) === 0)
        return array();
    $ret = array();
    foreach($array as $ray) {
        if(is_null($key)) {
            if(array_key_exists($value, $ray)) {
                $ret[] = $ray[$value];
            }
        } elseif(array_key_exists($key, $ray) && array_key_exists($value, $ray)) {
            $ret[$ray[$key]] = $ray[$value];
        }
    }
    return $ret;
}