WHILE - conditional loop


<WHILE condition>
  ... statements ...

The WHILE statement loops over its statements as long as the given condition is true. $loop is set to 0 before the loop is started, and is incremented at the bottom of every iteration. The condition has the same syntax as for IF.

A BREAK statement, if encountered, will exit the loop.

This example prints 10 image tags, for a bar graph:

<WHILE $loop lt 10>
  <IMG SRC=/icons/bar.gif BORDER=0>

The WHILE statement was added Feb. 6 1997.

An infinite loop can be created, if the condition is never false. Similarly, if the condition is never true, the loop is never executed.

Unlike other looping statements, $loop is set before the WHILE condition is first executed, so it always has the loop's value and not its previous value when the condition is tested. This can be used to run a loop a specified number of times without needing a separate iteration variable; e.g. <while $loop lt 10>...</while> will run 10 times.


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