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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 |
|---|---|
| 576 | /** |
| 577 | * Fires in the admin header for each specific form tab in the legacy |
| 578 | * (pre-3.5.0) media upload popup. |
| 579 | * |
| 580 | * The dynamic portion of the hook name, `$content_func`, refers to the form |
| 581 | * callback for the media upload type. |
| 582 | * |
| 583 | * @since 2.5.0 |
| 584 | */ |
| 585 | do_action( "admin_head_{$content_func}" ); |
| 586 | } |
| 587 | |
| 588 | $body_id_attr = ''; |
| 589 | |
| 590 | if ( isset( $GLOBALS['body_id'] ) ) { |
| 591 | $body_id_attr = ' id="' . $GLOBALS['body_id'] . '"'; |
| 592 | } |
| 593 | |
| 594 | ?> |