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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 | 
|---|---|
| 494 |      /** | 
| 495 |       * Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0) | 
| 496 |       * media upload popup are printed. | 
| 497 |       * | 
| 498 |       * @since 2.9.0 | 
| 499 |       */ | 
| 500 |      do_action( 'admin_head-media-upload-popup' ); | 
| 501 |  | 
| 502 |      /** This action is documented in wp-admin/admin-header.php */ | 
| 503 |      do_action( 'admin_head' ); | 
| 504 |  | 
| 505 | if ( is_string( $content_func ) ) { | 
| 506 |      /** | 
| 507 |       * Fires in the admin header for each specific form tab in the legacy | 
| 508 |       * (pre-3.5.0) media upload popup. | 
| 509 |       * | 
| 510 |       * The dynamic portion of the hook, `$content_func`, refers to the form | 
| 511 |       * callback for the media upload type. Possible values include | 
| 512 |       * 'media_upload_type_form', 'media_upload_type_url_form', and |