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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 |
|---|---|
| 503 | /** |
| 504 | * Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0) |
| 505 | * media upload popup are printed. |
| 506 | * |
| 507 | * @since 2.9.0 |
| 508 | */ |
| 509 | do_action( 'admin_head-media-upload-popup' ); |
| 510 | |
| 511 | /** This action is documented in wp-admin/admin-header.php */ |
| 512 | do_action( 'admin_head' ); |
| 513 | |
| 514 | if ( is_string( $content_func ) ) { |
| 515 | /** |
| 516 | * Fires in the admin header for each specific form tab in the legacy |
| 517 | * (pre-3.5.0) media upload popup. |
| 518 | * |
| 519 | * The dynamic portion of the hook, `$content_func`, refers to the form |
| 520 | * callback for the media upload type. Possible values include |
| 521 | * 'media_upload_type_form', 'media_upload_type_url_form', and |