WordPress hooks for executing right before any action or page loading

问题

I'm quite new to WP. Task is to develop a plugin for oauth authentication on one of not popular openID providers. I did the same for CodeIgniter project, but WP is a CMS and is little bit complex for me to understand. In Codeigniter i check authorisation before each action. In WP i need a hook which uses for it... before each page printing, or maybe.. it would be right to say before each action in terms of frameworks. What is this hook's name?

回答1:

A list of all available hooks can be found here: https://codex.wordpress.org/Plugin_API/Action_Reference

Information about Hooks: https://codex.wordpress.org/Plugin_API#Hooks.2C_Actions_and_Filters

Other hooks must be suggested and will be added in a future release if is a good suggestion. Or you'd have to edit the core files ;)

回答2:

You can use 'init' hook. It will be performed before element or html code. It`s also useful to manage POST and GET variables. The syntax is something like this:

function yourfunction() {
    dosomething();
}
add_action('init', yourfunction);

回答3:

Last hook before loading the template is template_redirect

You can use it like this:

function my_function(){
    // your code goes here
}
add_action( "template_redirect", "my_function" );

回答4:

You mean a hook when all wordpress function will available but before any output including headers sent?

Well hook your function on init. That will call when visiting site. If you want this hook only for admin area then it is admin_init.

来源：https://stackoverflow.com/questions/15948162/wordpress-hooks-for-executing-right-before-any-action-or-page-loading