while, do .. while, for Loops

looping.php

<?php
/**
 * O'Reilly p.87
 * while vs. for loop:
 * use while when condition DOES NOT depend on a simple, regular change to a var.
 * use while: when checking for SPECIAL INPUT OR ERROR and end loop when it occurs.
 */
$count2 = 0;
while ( $count2++ <= 12) {
echo "<p>$count2 times 12 is " . $count2 * 12 . "</p>";
}

// do .. while loop
$count3 = 0;
do {
  echo "$count3 times 12 is " . $count3 * 12 . "<br />";
}
while ( ++$count3 <= 12 );

/**
 * o'reilly p. 86
 * for loop:
 * use for single values THAT CHANGE ON REG BASIS, such as a list of user choices to process.
 *
 * more complex operations
 * (remember to distinguish btwn commas and semi-colons)
 * for ( $i = 0, $j = 0; $i + $j <= 10; $i++, $j++ )
 *
 * for ( initialization; terminating condition; modification )
 */
for ( $count = 0; $count <= 12; ++$count ) {
  echo $count times 12 is " . $count * 12 . "<br />";
}
?>