by Bhumi //Dec 17,2012 // 5 comments
WordPress provide functionality of action hook with which you can create your own action hook too.you can create new action hooks by calling
do_action() function and just need to specify the name of the new hook as $tag parameter.Whereas
add_action() is used to hooks a function on to a specific action.
do_action( $tag, $arg );
$tag is the name of the action to be executed.
$arg is an optional arguments which are passed on to the functions hooked to the action.
add_action( $tag, $function_to_add, $priority, $accepted_args );
Here is add_action,same like do_action $tag is the name of the action to be executed.Next argument is the name of the function to add for an action.Third argument defines the priority of code and fourth argument is for number of argument in the function.
Here in an example, going to show how to create an action hook that customize the login functionality just before the user logged into dashboard.
First of,place below code into the
wp-login.php file after post request for a form.
Next is use the function, which we can put in the
functions.php of the theme to add an action for the login
$result = $wpdb->get_var("Your_qry");
wp_redirect( site_url('wp-login.php') );
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