PHP Arrays: Pop an array of single-element arrays into one array
$out = array_map('array_shift', $in);e.g.
$in = array( array("id" => 241), array ("id" => 2), array ("id" => 81), array ("id" => 560), array ("id" => 10));$out = array_map('array_shift', $in);var_dump($out);prints
array(5) { [0]=> int(241) [1]=> int(2) [2]=> int(81) [3]=> int(560) [4]=> int(10)}