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Important warning about variable hooks

Some hooks have variables in their names. For example, pre_${taxonomy}_$field and admin_head- both have variable names. In general, any hook that ends (or begins) with - or _, or contains a $, has a variable name. Since the syntax with which these variables are defined may change from version to version, this page may think that a hook is deprecated (or new) even if it is not. You can usually catch this sort of thing by comparing this hook to the list of "related hooks" below.

WordPress version history for postbox_classes_{$screen_id}_{$box_id}

This database has information for all major versions from WP 1.2.1 through 6.2.

Version File Line Type
5.2 wp-admin/includes/post.php 1304 View in context filter
5.3 wp-admin/includes/post.php 1310 View in context filter
5.4 wp-admin/includes/post.php 1313 View in context filter
5.5 wp-admin/includes/post.php 1326 View in context filter
5.6 wp-admin/includes/post.php 1329 View in context filter
5.7 wp-admin/includes/post.php 1329 View in context filter
5.8 wp-admin/includes/post.php 1344 View in context filter
5.9 wp-admin/includes/post.php 1363 View in context filter
6.0 wp-admin/includes/post.php 1363 View in context filter
6.1 wp-admin/includes/post.php 1369 View in context filter
6.2 wp-admin/includes/post.php 1383 View in context filter

Related Hooks

We find related hooks using word stems. postbox_classes_{$screen_id}_{$box_id} has 6 significant word stem(s): postbox, classes, screen, id, box, id. Note that some of the hooks below may not appear in all versions of WP.