wp plugin -10

Commonly Used Action Hooks

（1）plugins_loaded。一个WP插件应该在此hook做setup。

It is fired after most of the WordPress files are loaded but before the pluggable functions and WordPress starts executing anything；plugins_loaded is executed when all the user’s activated plugins have been loaded by WordPress. It is also the earliest hook plugin developers can use in the loading process.

< ?php

add_action( ‘plugins_loaded’, ‘boj_footer_message_plugin_setup’ );

function boj_footer_message_plugin_setup() {

/* Add the footer message action. */

add_action( ‘wp_footer’, ‘boj_example_footer_message’, 100 );

}

function boj_example_footer_message() {

echo ‘This site is built using < a href=”http://wordpress.org”

title=”WordPress publishing platform” > WordPress < /a > .’;

}

? >

（2）init。The init hook is fired after most of WordPress is set up。

（3）admin_menu。The admin_menu hook is called only when an administration page loads。

< ?php

add_action( ‘admin_menu’, ‘boj_admin_settings_page’ );

function boj_admin_settings_page() {

add_options_page(

‘BOJ Settings’,

‘BOJ Settings’,

‘manage_options’,

‘boj_admin_settings’,

‘boj_admin_settings_page’

);

}

? >

（4）template_redirect。it’s the point where WordPress knows which page a user is viewing. It is executed just before the theme template is chosen for the particular page view.

< ?php

add_action( ‘template_redirect’, ‘boj_singular_post_css’ );

function boj_singular_post_css() {

if ( is_singular( ‘post’ ) ) {

wp_enqueue_style(

‘boj-singular-post’,

‘boj-example.css’,

false,

0.1,

‘screen’

);

}

}

? >

（5）wp_head。On the front end of the site, WordPress themes call the wp_head() function, which fi res the wp_head hook. Plugins use this hook to add HTML between the opening < head > tag and its closing < /head > .

< ?php

add_action( ‘wp_head’, ‘boj_front_page_meta_description’ );

function boj_front_page_meta_description() {

/* Get the site description. */

$description = esc_attr( get_bloginfo( ‘description’ ) );

/* If a description is set, display the meta element. */

if ( !empty( $description ) )

echo ‘ < meta name=”description” content=”’ . $description . ‘” / > ’;

}

? >

js不应该使用此hook，而应该使用wp_enqueue_script。除非是js不在另一单独分离的文件中。