<?php 
// PHP program for implementation 
// of Bubble Sort
  
function bubbleSort(&$arr)
{
    $n = sizeof($arr);
  
    // Traverse through all array elements
    for($i = 0; $i < $n; $i++) 
    {
        // Last i elements are already in place
        for ($j = 0; $j < $n - $i - 1; $j++) 
        {
            // traverse the array from 0 to n-i-1
            // Swap if the element found is greater
            // than the next element
            if ($arr[$j] > $arr[$j+1])
            {
                $t = $arr[$j];
                $arr[$j] = $arr[$j+1];
                $arr[$j+1] = $t;
            }
        }
    }
}
  
// Driver code to test above
$arr = array(64, 34, 25, 12, 22, 11, 90);
  
$len = sizeof($arr);
bubbleSort($arr);
  
echo "Sorted array : \n";
  
for ($i = 0; $i < $len; $i++)
    echo $arr[$i]." "; 
  
// This code is contributed by ChitraNayal.
?>