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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
484 | /** |
485 | * Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0) |
486 | * media upload popup are printed. |
487 | * |
488 | * @since 2.9.0 |
489 | */ |
490 | do_action( 'admin_head-media-upload-popup' ); |
491 |
|
492 | /** This action is documented in wp-admin/admin-header.php */ |
493 | do_action( 'admin_head' ); |
494 |
|
495 | if ( is_string( $content_func ) ) { |
496 | /** |
497 | * Fires in the admin header for each specific form tab in the legacy |
498 | * (pre-3.5.0) media upload popup. |
499 | * |
500 | * The dynamic portion of the hook, `$content_func`, refers to the form |
501 | * callback for the media upload type. Possible values include |
502 | * 'media_upload_type_form', 'media_upload_type_url_form', and |