Overriding functions in wordpress plugins

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I notice that in some plugins you can override functions by …

  1. Creating an uploads folder
  2. Creating a folder with the plugin name

  3. Using the following code

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    if (!function_exists('function_name')) {
    function function_name() {

    }
}

Is this standard for all WordPress plugins or only if they’re written in a specific way?

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2 comments

  1. If the plugin displays content via any function, the code:

    if(!function_exists('function_name')) function_name();

    … is used for safety.

    If your plugin is disabled, and the if (!function_exists('function_name')) is missing, your theme will throw a fatal error.

  2. These are referred to as pluggable functions, and are intended to be able to be over-ridden, either by Plugins, Themes, or Child Themes.

    It is only standard for functions that are intended to be over-ridden – and, generally speaking, the better practice is to add filter hooks to function outputs, rather than making functions pluggable.