WordPress at a glance
filter is not described

post_(field) filter-hook . WP 2.3.0

Filters the value of a specific post field for display.

The dynamic portion of the hook name, $field, refers to the post field name.

Usage

add_filter( 'post_(field)', 'filter_function_name_2186', 10, 3 );
function filter_function_name_2186( $value, $post_id, $context ){
	// filter...

	return $value;
}
$value(mixed)
Value of the prefixed post field.
$post_id(int)
Post ID.
$context(string)
Context for how to sanitize the field. Possible values include 'raw', 'edit', 'db', 'display', 'attribute' and 'js'.

Where the hook is called

sanitize_post_field()
post_(field)
wp-includes/post.php 2256
$value = apply_filters( "post_{$field}", $value, $post_id, $context );

Where the hook is used (in WP core)

wp-includes/default-filters.php 87
add_filter( 'post_mime_type', 'sanitize_mime_type' );
wp-includes/default-filters.php 339
add_action( 'post_updated', 'wp_save_post_revision', 10, 1 );
wp-includes/default-filters.php 376
add_action( 'post_updated', 'wp_check_for_changed_slugs', 12, 3 );
wp-includes/default-filters.php 380
add_action( 'post_updated', 'wp_check_for_changed_dates', 12, 3 );
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php 1577
add_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php 1589
remove_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 295
add_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 311
remove_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 409
add_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 1511
add_filter( 'post_password_required', '__return_false' );
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php 1538
remove_filter( 'post_password_required', '__return_false' );
wp-admin/includes/admin-filters.php 155
add_action( 'post_updated', array( 'WP_Privacy_Policy_Content', '_policy_page_updated' ) );