- array_sum: documentation ( source)
<?php
$r=array(78, 60, 62, 68, 71, 68, 73, 85, 66, 64, 76, 63, 75, 76, 73, 68, 62, 73, 72, 65, 74,
62, 62, 65, 64, 68, 73, 75, 79, 73);
$sum=array_sum($r);
$cnt=count($r);
$avg=$sum/$cnt;
echo "Average Temperature is ".$avg."<br>";
?>