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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 |
|---|---|
| 592 | /** |
| 593 | * Fires in the admin header for each specific form tab in the legacy |
| 594 | * (pre-3.5.0) media upload popup. |
| 595 | * |
| 596 | * The dynamic portion of the hook name, `$content_func`, refers to the form |
| 597 | * callback for the media upload type. |
| 598 | * |
| 599 | * @since 2.5.0 |
| 600 | */ |
| 601 | do_action( "admin_head_{$content_func}" ); |
| 602 | } |
| 603 | |
| 604 | $body_id_attr = ''; |
| 605 | |
| 606 | if ( isset( $GLOBALS['body_id'] ) ) { |
| 607 | $body_id_attr = ' id="' . $GLOBALS['body_id'] . '"'; |
| 608 | } |
| 609 | |
| 610 | ?> |