How to verify that a specific plugin is installed and/or activated?

[jeffshead]

I searched but did not find an answer.

In a separate plugin, I would like to display a link but only if the plugin named Ip-Viewer (https://github.com/faab007nl/Yourls-Ip-Viewer) is installed and activated.

For example:

if ( the Ip-Viewer plugin is installed && activated ) {
    echo "<a href='" . $yourls_site . "/admin/plugins.php?page=ip-viewer&shortcode='" . $keyword . "'>View IP log</a>";
} else {
    echo 'You need to install and activate the Ip-Viewer plugin!';
}

What is the correct, actual code to use for the if statement?

[dgw]

You will need to know the full path to the plugin file. These functions can help get the available plugins (with info) and check if a specific plugin is active:

YOURLS/includes/functions-plugins.php

Lines 483 to 511 in 6da30df

	/**
	* List plugins in /user/plugins
	*
	* @return array Array of [/plugindir/plugin.php]=>array('Name'=>'Ozh', 'Title'=>'Hello', )
	*/
	function yourls_get_plugins() {
	$plugins = (array)glob( YOURLS_PLUGINDIR.'/*/plugin.php' );
	if ( is_array( $plugins ) ) {
	foreach ( $plugins as $key => $plugin ) {
	$plugins[ yourls_plugin_basename( $plugin ) ] = yourls_get_plugin_data( $plugin );
	unset( $plugins[ $key ] );
	}
	}
	return empty( $plugins ) ? [] : $plugins;
	}
	/**
	* Check if a plugin is active
	*
	* @param string $plugin Physical path to plugin file
	* @return bool
	*/
	function yourls_is_active_plugin( $plugin ) {
	return yourls_has_active_plugins() > 0 ?
	in_array( yourls_plugin_basename( $plugin ), yourls_get_db()->get_plugins() )
	: false;
	}

[jeffshead]

Unbelievable!!!

I searched functions-plugins.php a couple three times and overlooked yourls_is_active_plugin() every time.

Thank you, DGW.