algorithm - Why does this porting of C to PHP of Bubble Sort do not work? -

i decided create helper files languages containing sorting algorithms ans searching algorithms. started c , wanted make adjacent in php. array passing not getting sorted. why?

<?php         function bubblesort($array, $length)     {         for($i = 0; $i < $length - 1; ++$i)         {             for($j = 0; $j < $length - $i - 1; ++$j)             {                 if($array[$j] > $array[j + 1])                 {                     $tmp = $array[$j];                     $array[j] = $array[j + 1];                     $array[j + 1] = $tmp;                 }             }         }       }         $array = [5,2,3,1,2];     $size = 5;      print "array now: ";      for($i = 0; $i < $size; $i++)     {         print "{$array[$i]} ";     }      print "\n";      bubblesort($array, $size);      for($i = 0; $i < $size; $i++)     {         print "{$array[$i]} ";     }      print "\n";      ?> 

you not passing array reference, hence function has return array , have assign original array.

provided there no syntax errors otherwise, didn't at.