Converting php array of arrays into single array

Question

I have an array whose values are all arrays of a specific format that looks like this:

Array
(
    [0] => Array
           (
               [username] => John
           )    
    [1] => Array
           (
               [username] => Joe
           )
    [2] => Array
           (
               [username] => Jake
           )
)

and I would like to have this:

Array
(
    [0] => John   
    [1] => Joe
    [2] => Jake
)

I can do this manually with a loop but is there a better way? If not, is it possible to do this for an array of objects that have a common attribute?

Answer 1

why complicate things?

foreach($array as $k=>$v) {
    $new[$k] = $v['username'];
}

Answer 2

If you're using PHP 5.3 you can make use of array_walk_recursive and a closure (the closure can be replaced by a normal function if your PHP version < 5.3):

function arrayFlatten(array $array) {
    $flatten = array();
    array_walk_recursive($array, function($value) use(&$flatten) {
        $flatten[] = $value;
    });

    return $flatten;
}

$nested = array(
    array('username' => 'John'),
    array('username' => 'Joe'),
    array('username' => 'Jake'),
);

$flattened = arrayFlatten($nested);

var_dump($flattened)

array
  0 => string 'John' (length=4)
  1 => string 'Joe' (length=3)
  2 => string 'Jake' (length=4)

Answer 3

$new = array_map(create_function('$auser', 'return $auser["username"];'), $array);

If using objects you could just change return $auser["username"]; to return $auser->get_username();

Answer 4

Use this code .

foreach ( $arr as $key => $val ) { sort($val ); $new = array_merge($val,$new) ; } print_r ( $new ) ;