find largest element of an array in php

<?php 
$array = array(5,7,81,0,12);

$max1 =0 ;
$max2 = 0;

for($i=0; $i $max1)
    {
      $max2 = $max1;
      $max1 = $array[$i];
    }
    else if($array[$i] > $max2)
    {
      $max2 = $array[$i];
    }
}
echo "Maximum value = ".$max1;
echo "
"; 
echo "Second maximum Value =".$max2;
?>