while loop is the simplest loop in PHP, its basic format is:
while (expr){ statement }
或者
while (expr): statement endwhile;
This syntax means that as long as the expr expression is TRUE, the statement will be executed until expr is FALSE. The statement represents the action or logic to be executed.
<?php $i = 1; while ($i <= 10) { echo $i; $i++; } ?>
This example loops out 1 to 10.
Original address: http://www.manongjc.com/php/php_while.html
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