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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 |
|---|---|
| 465 | /** |
| 466 | * Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0) |
| 467 | * media upload popup are printed. |
| 468 | * |
| 469 | * @since 2.9.0 |
| 470 | */ |
| 471 | do_action( 'admin_head-media-upload-popup' ); |
| 472 | |
| 473 | /** This action is documented in wp-admin/admin-header.php */ |
| 474 | do_action( 'admin_head' ); |
| 475 | |
| 476 | if ( is_string( $content_func ) ) { |
| 477 | /** |
| 478 | * Fires in the admin header for each specific form tab in the legacy |
| 479 | * (pre-3.5.0) media upload popup. |
| 480 | * |
| 481 | * The dynamic portion of the hook, $content_func, refers to the form |
| 482 | * callback for the media upload type. Possible values include |
| 483 | * 'media_upload_type_form', 'media_upload_type_url_form', and |