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

• Function Reference/is plugin active « WordPress Codex
  Description. Checks if a plugin is activated. NOTE: defined in wp-admin/includes/ plugin.php, so this is only available from within the admin pages. If you want to ...
  codex.wordpress.org
• WordPress › Support » is_plugin_active
  Fatal error: Call to undefined function is_plugin_active() in /home/xxxx/xx ... Also, I don't see is_plugin_active in functions.php for WP v3.0.1. Has this function ...
  wordpress.org
• plugins - is_plugin_active function doesn't exist - WordPress
  Feb 14, 2011 ... In the main PHP file of my plugin, when I try to call is_plugin_active I get Call to undefined function is_plugin_active() . I can call add_action and ...
  wordpress.stackexchange.com
• How Do I Programmatically Check if a WordPress Plugin Is Already ...
  http://codex.wordpress.org/Function_Reference/is_plugin_active <?php if (! is_plugin_active('plugin-directory-path/plugin-file.php')) ...
  stackoverflow.com

Meer ...

• Frank P. Walentynowicz on "is_plugin_active"
• Philip Arthur Moore on "is_plugin_active"
• Curtiss Grymala on "Determine if a Plugin is "Network Activated""
• Andrea_r on "Determine if a Plugin is "Network Activated""
• Curtiss Grymala on "Determine if a Plugin is "Network Activated""
• Andrea_r on "Determine if a Plugin is "Network Activated""
• Curtiss Grymala on "Determine if a Plugin is "Network Activated""
• saphod on "is_plugin_active"
• Andrea_r on "Determine if a Plugin is "Network Activated""
• Curtiss Grymala on "Determine if a Plugin is "Network Activated""

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