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What I Wish I’d Known
When I Started
Erick Hitter
@ethitter
https://ethitter.com/
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FIRST
Can’t check if the user’s
logged in until init
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SECOND
The query isn’t
available until wp
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THIRD
Never build a
manual link again
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Link Functions
•get_permalink()
•get_page_by_path( 'about' )
•get_post_type_archive_link( 'waffles' )
•user_trailingslashit()
•get_year_link()
•get_adjacent_post()
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Link Functions
•add_query_arg()
•remove_query_arg()
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Link Functions
•home_url( '/' )
Many more in
wp-‐includes/link-‐template.php.
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FOURTH
Escaping and
Sanitization
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FIFTH
Nonces
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SIXTH
Ajax is easy
with WordPress
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Ajax
• Hook your function to one of two variable
actions
• Use the same action name with the request to
admin-‐ajax.php
•check_ajax_referer() or use a nonce
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Ajax
•wp_ajax_{$your_action}
•wp_ajax_nopriv_{$your_action}
• Hook to both if logged-in state isn’t relevant.
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SEVENTH
Database Interactions
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Database Interactions
• Use custom post types and custom taxonomies
instead.
• If you must, always $wpdb-‐>prepare() your
queries.
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Database Interactions
•$wpdb-‐>get_var()
•$wpdb-‐>get_col()
•$wpdb-‐>get_row()
•$wpdb-‐>insert( $table, $data, $format )
•$wpdb-‐>update( $table, $data, $where,
$format, $where_format )
•$wpdb-‐>query()
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EIGHTH
Enqueue All
The Things
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Register, then enqueue!
•wp_register_style()
•wp_register_script()
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Enqueue!
•wp_enqueue_style()
•wp_enqueue_script()
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But why?
• Reusable
• Dependencies
• Versioning
• Minification
• Concatenation
• CDN
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NINTH
Cache All
The Things
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Caching
• Transients
• Object Cache
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TENTH
Remote Requests
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WP HTTP API
•wp_remote_get()
•wp_remote_post()
•wp_remote_head()
•wp_remote_request()
•wp_remote_retrieve_response_code()
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ELEVENTH
Miscellany
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Miscellany
•get_queried_object()
•get_queried_object_id()
•wp_parse_args()
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Thanks
Erick Hitter
@ethitter
https://ethitter.com/
https://eth.pw/wcywg15