PHP Array Exercises : Calculate and display average temperature

<?php
// Define a string of monthly temperatures separated by commas
$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";

// Split the string into an array using commas as the delimiter
$temp_array = explode(',', $month_temp);

// Initialize variables for total temperature and the length of the temperature array
$tot_temp = 0;
$temp_array_length = count($temp_array);

// Iterate through the temperature array, calculate the total temperature
foreach($temp_array as $temp)
{
 $tot_temp += $temp;
}

// Calculate the average high temperature
$avg_high_temp = $tot_temp / $temp_array_length;

// Display the average temperature
echo "Average Temperature is : " . $avg_high_temp . "";

// Sort the temperature array in ascending order
sort($temp_array);

// Display the list of five lowest temperatures
echo " List of five lowest temperatures :";
for ($i = 0; $i < 5; $i++)
{ 
    echo $temp_array[$i] . ", ";
}

// Display the list of five highest temperatures
echo "List of five highest temperatures :";
for ($i = ($temp_array_length - 5); $i < $temp_array_length; $i++)
{
    echo $temp_array[$i] . ", ";
}
?>