How can I call a function from one plugin within another plugin?

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I have a basic plugin in the admin options panel for events.

I want to call a function that is from a different social media plugin (Mingle). I can call the plugin functions in the theme, but not within core files of other plugins, or other plugins’ admin panels it seems.

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I have tried including the other plugin’s files, adding a hook to the theme functions file, add_action, add_filter, init etc. But I do not know what the first argument for those actions would be, since I want the function inserted into a specific admin page from another plugin.

The only solution that has worked is merging the code of the two plugins, although it seems odd that there is not a simpler method.

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2 comments

  1. Maybe you should try calling the functions of your plugin using the plugins_loaded action.

    Plugin A

    class PluginA {
  public function func_a() {
    // do stuff
  }
}

    Plugin B

    class PluginB {
  function functB() {
    if (class_exists('PluginA')) {
      //do stuff that depends of PluginA
    }
  }
}

add_action('plugins_loaded', 'call_plugin_a_using_plugin_b');
function call_plugin_a_using_plugin_b() {
  PluginB::functB();
}

    According to the Codex, the plugins_loaded action fires after all plugins are loaded, so making sure that all plugins are loaded before calling a function from other plugin might be the way to go.

  2. To call one function from one plugin in another plugin (inception?), you can try the following login:

    You can try by checking for the function you want before doing anything else.

    Plugin A:

    function from_plugin_alpha( some_thing ) {
    // do stuff
}

    Plugin B:

    function from_plugin_bravo() {
    if ( !function_exists( 'from_plugin_alpha' ) ) {
        return;
    }
    from_plugin_alpha( some_thing );
}

    This checks that function exists before executing your custom code.