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PHP Version numbering convention

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Last Modified: 2014-12-24
Does anyone know what the PHP numbering convention is?

So for example 5.4.3 what do the numbers indicate? Is one of the numbers for functionality, security, major release etc?

Or does the numbers mean nothing.

Thanks.
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Dave BaldwinFixer of Problems
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The first two numbers seem to be the major versions while the third number seems to be about revisions and fixes for that version.  I take the migration guides to be an indicator of what the importance of the numbers is.  Note that you can't take extensions from one version (like PHP 5.2) and use them in a newer version (like PHP 5.4).  If you look on the download pages, especially for Windows, you will see that the compiler versions that are used also make a difference.

http://php.net/manual/en/history.php
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