module_exist

Determine whether a given module exists.

$module The name of the module (without the .module extension).

TRUE if the module is both installed and enabled.

block_admin_display in modules/block.module: Prepare the main block administration form.
chameleon_node in themes/chameleon/chameleon.theme
forum_page in modules/forum.module: Menu callback; prints a forum listing.
menu_rebuild in includes/menu.inc: Populate the database representation of the menu.
node_menu in modules/node.module: Implementation of hook_menu().
system_module_listing in modules/system.module: Generate a list of all the available modules, as well as update the system list.
system_theme_settings in modules/system.module: Menu callback; display theme configuration for entire site and individual themes.
theme_aggregator_block_item in modules/aggregator.module: Format an individual feed item for display in the block.
theme_forum_display in modules/forum.module: Format the forum body.
theme_get_settings in includes/theme.inc: Retrieve an associative array containing the settings for a theme.
theme_node in includes/theme.inc: Return a themed node.
tracker_page in modules/tracker.module: Menu callback. Prints a listing of active nodes on the site.
user_menu in modules/user.module: Implementation of hook_menu().
xtemplate_node in themes/engines/xtemplate/xtemplate.engine
_menu_build in includes/menu.inc: Build the menu by querying both modules and the database.

includes/module.inc, line 98

<?php
function module_exist($module) {
  $list = module_list();
  return array_key_exists($module, $list);
}
?>

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