Five Events In The Life Of Every WordPress

Request You Should Know

Josh Pollock

How Do We Get From This?

To This

Magic?

You're About To Get Super Powers

Let's Talk About Hooks

A hook is an event

Actions

Do Something At This Point

do_action( 'something' );

add_action( 'something', function() {echo 'Doing Something';

});

Filters

Change Something At This Point

$something = apply_filters( 'something', 'something' );add_filter( 'something', function( $something) {

$something = 'something else';return $something

});

You've Seen This Before

add_filter( 'the_content', function( $content ) {$content .= '<a href="#">Share</a>';return $content;

}add_action( 'wp_head', function() {

echo "<script>alert( KHAAAAAAN!' ); </script>";}

What Does WordPress Do?

Five Events You Should Know

init

/wp-includes/class-wp.php

Fires When WordPress Is Loaded

/wp-includes/class-wp.php

Before:● muplugins_loaded● plugins_loaded● setup_theme● after_setup_themeAfter:● wp_loaded

Related Actions

request

/wp-includes/class-wp.php

Modifies Query Vars Before Building WP_Query

/wp-includes/class-wp.php

Actions:● parse_request● send_headersFilters:● query_string● wp_headers

Related Hooks

pre_get_posts

/wp-includes/query.php

Modifies WP_Query Arguments Before Querying

/wp-includes/query.php

Actions:● start_loop● end_loopFilters:● the_posts● the_post

Related Hooks

template_redirect

/wp-includes/template.php

Before Choosing A Template

/wp-includes/template.php

Do something instead of the template hierarchy.

WHY?

THEN THE TEMPLATE HIERARCHY HAPPENS

template_includes

/wp-includes/template.php

Change the template selected by the template hierarchy

WHY?

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