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Fail Safe WordPress Plugin Invokation
A lot of WordPress plugins require to change your site's code a bit. My Randomized Blogroll plugin does it, and so do for example the Recent Posts, the Breadcrumb Navigation, and the Subscribe to Commments plugins, which I run on my site.
Changing your site's code normally is done by adding a function call at the approbiate place, like this:
<php some_plugin_function(); ?>
This works fine if the according plugin is enabled, but as soon as it is disabled, PHP will spit out an error saying "Function some_plugin_function not found" and stop processing. This can be very annoying, if you are disabling plugins temporarely, for example due to debug purposes.
However, PHP offers a quite easy way to deal with this. Just check if the function exists (which is: the plugin is enabled and therefore loaded):
<php if ( function_exists("some_plugin_function") )
{
some_plugin_function();
}
?>
Now, PHP will invoke the function only if the plugin is enabled.
