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Plugin is defining pluggable wp_mail() function. My idea was to check if function is defined already and throw warning if other plugin beat me to it.

However this warning causes issues on activation. As far as I understand during normal operation plugin is loaded before pluggable.php but for the purpose of activation check it is loaded after pluggables.

What would be the robust/proper/suggested way to implement such check for pluggable function? There is no obvious (for me) way to distinguish activation and handle it separately.

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isn't "function_exists()" good enough ? – Bainternet♦ Mar 9 '11 at 13:21
@Bainternet on activation pluggables.php had already been processed and wp_mail() always exists. – Rarst♦ Mar 9 '11 at 13:33
@Rarst then i guess I'm missing the point here. – Bainternet♦ Mar 9 '11 at 13:35
@Bainternet the point is that load order is different on activation and I don't see a robust way to handle that. I cannot implement check for environment I need if environment is not the same because of different load order. – Rarst♦ Mar 9 '11 at 13:49
@Rarst thanks for explaining, then in that case i have no idea. – Bainternet♦ Mar 9 '11 at 13:55
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Don't do the check on activation?

Seriously, the best way I can think of is not to check for this on activation, but only in the normal plugin load process. And instead of throwing a warning (I assume you mean a PHP E_WARNING), perhaps putting an admin error box up would make more sense.

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Still same sub-question - how do I know it is activation? The idea to check for plugins_loaded fired might work, but had not tested yet. Warning was more of a debug thing. Overall I no longer think this makes much sense to mess with in my case, but still interested in technical side. – Rarst♦ Mar 17 '11 at 12:45
A plugin should never really do anything just by being included. Everything should be put in a function that is hooked somewhere. plugins_loaded isn't run on the activation include, so any actual checks you want to do at "load" time should be hooked there. – Otto Mar 18 '11 at 15:44
please see context - plugins_loaded fires after loading pluggable stuff. It is useless for check if specific pluggable function is available and useless for defining such function. I don't see another way of timing defining pluggable function other than on include. – Rarst♦ Mar 18 '11 at 17:29
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You can do checks on include, sure, but you need to defer taking actions on the results of those checks until at least plugins_loaded. In other words, you can check for a function's existence at include time, but you need to wait until at least plugins_loaded before doing anything like throwing up a warning or something. – Otto Mar 19 '11 at 19:54

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