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Project Type: WordPress Reference

Error Handling

WordPress error handling system using the WP_Error class pattern and PHP error/exception handling. Since: 2.1.0 (WP_Error), 5.2.0 (Fatal Error Handler), 6.7.0 (WP_Exception) Source: wp-includes/class-wp-error.php, wp-includes/class-wp-exception.php, wp-includes/class-wp-fatal-error-handler.php, wp-includes/error-protection.php Components Component Description...

February 12, 2026 Read More

Error Functions

Core functions for error checking, termination, and error protection. Source: wp-includes/load.php, wp-includes/functions.php, wp-includes/error-protection.php Error Checking is_wp_error() Checks whether a variable is a WP_Error instance. function is_wp_error( mixed $thing ): bool...

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Error Hooks

Actions and filters for WordPress error handling. Actions wp_error_added Fires when an error is added to a WP_Error object. do_action( 'wp_error_added', string|int $code, string $message, mixed $data, WP_Error $wp_error )...

February 12, 2026 Read More

Email Hooks

Actions and filters for customizing WordPress email functionality. Source: wp-includes/pluggable.php, wp-includes/ms-functions.php Filters wp_mail Filter all wp_mail() arguments before processing. apply_filters( 'wp_mail', array $args ) Since: 2.2.0 Parameter Type Description $args...

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WP_Embed Class

API for embedding rich media content from URLs into post content. Since: 2.9.0 Source: wp-includes/class-wp-embed.php Overview WP_Embed is the core class that processes content and converts URLs to embedded media....

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WP_oEmbed Class

Core class for fetching HTML embeds from oEmbed provider APIs. Since: 2.9.0 Source: wp-includes/class-wp-oembed.php Overview WP_oEmbed is the consumer-side oEmbed implementation. It: Maintains list of trusted oEmbed providers Fetches embed...

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Embeds / oEmbed API

Framework for embedding rich media content from URLs, both consuming external oEmbed providers and serving WordPress content as embeddable. Since: 2.9.0 (consuming), 4.4.0 (provider) Source: wp-includes/embed.php, wp-includes/class-wp-embed.php, wp-includes/class-wp-oembed.php Components Component...

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Embed Functions

Core functions for embedding content and managing oEmbed providers. Source: wp-includes/embed.php Handler Registration wp_embed_register_handler() Registers a custom embed handler for URLs that don't support oEmbed. wp_embed_register_handler( string $id, string $regex,...

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Embed Hooks

Actions and filters for the WordPress Embeds/oEmbed system. Filters Provider Management oembed_providers Filters the list of registered oEmbed providers. apply_filters( 'oembed_providers', array $providers ): array Location: WP_oEmbed::__construct() Parameters: $providers -...

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Email System

WordPress email architecture built on PHPMailer with extensive hook-based customization. Source: wp-includes/pluggable.php, wp-includes/PHPMailer/, wp-includes/class-wp-phpmailer.php Components Component Description class-wp-phpmailer.md WordPress PHPMailer extension with i18n hooks.md All email-related actions and filters Architecture...

February 12, 2026 Read More
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