PHP - Array Concatenation

<?php
 function concat() {
    $vars=func_get_args();
    $array=array();
    foreach ($vars as $var) {
       if (is_array($var)) {
          foreach ($var as $val) {$array[]=$val;}
       } else {
          $array[]=$var;
       }
    }
    return $array;
 }
?>

<?php
 $val1=array("one",2,"3");
 $val2="4";
 $val3=array(5,6);
 $val4=7;
 $val5=array();
 $concat1=concat($val1,$val2,$val3,$val4,$val5);
 var_dump($concat1);
 $concat2=concat($concat1,array(8,9),"010");
 var_dump($concat2);
?>

array(7) {
  [0]=> string(3) "one"
  [1]=> int(2)
  [2]=> string(1) "3"
  [3]=> string(1) "4"
  [4]=> int(5)
  [5]=> int(6)
  [6]=> int(7)
}
array(10) {
  [0]=> string(3) "one"
  [1]=> int(2)
  [2]=> string(1) "3"
  [3]=> string(1) "4"
  [4]=> int(5)
  [5]=> int(6)
  [6]=> int(7)
  [7]=> int(8)
  [8]=> int(9)
  [9]=> string(3) "010"
}