Write a PHP script to calculate and display average temperature, five lowest and highest temperatures

PHP is a server scripting language, and It is a powerful tool for making interactive and dynamic Web-pages. I have used WampServer 2.2 for following excercise..

<?php
$month_temp = "78, 60, 62, 68, 71, 68, 73, 85, 66, 64, 76, 63, 81, 76, 73,
68, 72, 73, 75, 65, 74, 63, 67, 65, 64, 68, 73, 75, 79, 73";
$temp_array = explode(',', $month_temp);
$tot_temp = 0;
$temp_array_length = count($temp_array);
foreach($temp_array as $temp)
{
 $tot_temp += $temp;
}
 $avg_high_temp = $tot_temp/$temp_array_length;
 echo "Average Temperature is : ".$avg_high_temp."
"; 
sort($temp_array);
echo " <br>List of five lowest temperatures :";
for ($i=0; $i< 5; $i++)
{ 
echo $temp_array[$i].", ";
}
echo "<br>List of five highest temperatures :";
for ($i=($temp_array_length-5); $i< ($temp_array_length); $i++)
{
echo $temp_array[$i].", ";
}
?>

Result:
Average Temperature is : 70.6
List of five lowest temperatures : 60, 62, 63, 63, 64,
List of five highest temperatures : 76, 78, 79, 81, 85,