[wp-hackers] readme.txt: "Requires PHP 5 tag"

[Aaron D. Campbell]

Are you sure about that?  It looks like the deactivation hook is 
silently skipped, but it looks like the activation hook runs normally on 
an auto upgrade.

Stephen Rider wrote:
> That won't work for auto-updates (a plugin going from "works with PHP 
> 4+" to "works with PHP 5+").
>
> The activation hook does not fire during auto update.
>
> On Jul 14, 2009, at 3:41 PM, Otto wrote:
>
>> Don't rely on users, they're invariably idiots. ;)
>>
>> Make your plugin smarter instead.
>>
>> /**
>> * plugin_activation_check()
>> *
>> * Replace "plugin" with the name of your plugin
>> */
>> function plugin_activation_check(){
>>     if (version_compare(PHP_VERSION, '5.0.0', '<')) {
>>         deactivate_plugins(basename(__FILE__)); // Deactivate ourself
>>         wp_die("Sorry, but you can't run this plugin, it requires PHP 
>> 5 or higher.");
>>     }
>> }
>> register_activation_hook(__FILE__, 'plugin_activation_check');