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To: Yasuo Ohgaki <yohgaki@ohgaki.net>
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Date: Mon, 03 Feb 2014 23:09:41 +0100
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Subject: Re: [PHP-DEV] Declare minimum PHP version required?
From: johannes@schlueters.de (Johannes =?ISO-8859-1?Q?Schl=FCter?=)

On Tue, 2014-02-04 at 04:46 +0900, Yasuo Ohgaki wrote:
> I may be worried to much, but I don't like run time environment checks
> which evaluated over and over. There are many codes that checks PHP
> version, loaded extension, library version, etc to make sure code works as
> it should be. Perhaps, more generic form might be better
> 
> declare('requirements') {
>   if (version_compare(PHP_VERSION, '5.6.0', '<')) {
>      echo 'You need PHP 5.6.0 or later';
>      return FALSE;
>   }
>   if (!extension_loaded('foo')) {
>      echo 'You need foo extension';
>      return FALSE;
>   }
>   // and so on
>   return TRUE;
> }
> 

That still has to run each time the file is included.

johannes