Do repetitive processing by while loop.
In PHP, there are two methods to write while loop.
One is to use curly brackets {}. The other is to use colon: and "endwhile".

<?php

$i = 0;
while ($i < 5) {
    echo "i = " . $i++ . "\n";
}

echo "\n\n";

$j = 0;
while ($j < 5):
    echo "j = " . $j++ . "\n";
endwhile;

?>

      

$ php while_loop.php
i = 0
i = 1
i = 2
i = 3
i = 4


j = 0
j = 1
j = 2
j = 3
j = 4