02.4: While Loops

What if we want to do the same task over and over again until some condition is met? Or if we have a large set of data to process? In this lesson we will start looking at loops.

<?php
# * While loops

$lower = 0;
$upper = 10;

while ($lower <= $upper)    {
    print "lower: $lower\n";

    $lower += 1;
}

# * Exercise: Modify the fahrenheight to celcius script to run 
# * in a loop from 0f to 300f in 10 degree increments and print the output.

?>