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<?php
$a=array("a"=>"red","b"=>"green","c"=>"blue");
echo array_shift($a);
print_r ($a);
?>

<?php
$a=array(0=>"red",1=>"green",2=>"blue");
echo array_shift($a);
print_r ($a);
?>

<?php
$arr = array('1'=>1,'2'=>2,'3'=>'3');

function array_kshift(&$arr)
{
  list($k) = array_keys($arr);
  $r  = array($k=>$arr[$k]);
  unset($arr[$k]);
  return $r;
}
array_kshift($arr);
print_r($arr);
?>

Array
(
    [2] => 2
    [3] => 3
)