find largest element of an array in php

1<?php 
2$array = array(5,7,81,0,12);
3
4$max1 =0 ;
5$max2 = 0;
6
7for($i=0; $i $max1)
8    {
9      $max2 = $max1;
10      $max1 = $array[$i];
11    }
12    else if($array[$i] > $max2)
13    {
14      $max2 = $array[$i];
15    }
16}
17echo "Maximum value = ".$max1;
18echo "
19"; 
20echo "Second maximum Value =".$max2;
21?> 
22