is_plugin_active() returning false on active plugin

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So I have the following in an include in my theme file: 

include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
if ( is_plugin_active( WP_PLUGIN_DIR . '/woocommerce/woocommerce.php' ) ) {
  $shop_id = woocommerce_get_page_id( 'shop' );
  $shop_page = get_page( $shop_id );
}

but is_plugin_active( WP_PLUGIN_DIR . '/woocommerce/woocommerce.php') is returning false, despite the fact that the plugin is active.

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I’m wondering if is_plugin_active() might be tripped up by the theme customizer, because the fact that I’m doing this while hooked to customize_preview_init is the only gotcha that I can imagine would be causing issue. Any insights?

Post Views: 2

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2 comments

  1. is_plugin_active() expects just the base name of the plugin as parameter:

    So use:

    is_plugin_active( 'woocommerce/woocommerce.php' );

    The function will use the option 'active_plugins' which is a list of plugins paths relative to the plugin directory already.

    On a multi-site installation it will search in get_site_option( 'active_sitewide_plugins') too.

    As an implementation note: Avoid these checks. Some users rename plugin names or directories. Test for the functions you will actually use instead, eg:

    if ( function_exists( 'woocommerce_get_page_id' ) )
{
    // do something
}

  2. in case you dont know which plugins are active you can do the following.

    // get array of active plugins
$active_plugins = (array) get_option( 'active_plugins', array() );
// see active plugins 'plugin-dir-name/plugin-base-file.php'
echo '<pre>';
print_r( $active_plugins );
echo '</pre>';
if ( ! empty( $active_plugins ) && in_array( 'plugin-dir-name/plugin-base-file.php', $active_plugins ) ) {
    // do something if plugin is active
}

    for reference take a look into is_plugin_active function inside ‘wp-admin/includes/plugin.php’

    function is_plugin_active( $plugin ) {
    return in_array( $plugin, (array) get_option( 'active_plugins', array() ) ) || is_plugin_active_for_network( $plugin );
}

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