PHP Manual
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# while syntax

Just like with if..endif, the syntax of while..endwhile has changed as well:

Example D-6. Migration: old while..endwhile syntax
    while ($more_to_come);
        ...
    endwhile;

Example D-7. Migration: new while..endwhile syntax
    while ($more_to_come):
        ...
    endwhile;

Warning
If you use the old while..endwhile syntax in PHP 3.0, you will get a never-ending loop.

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