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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 |
|---|---|
| 544 | * (pre-3.5.0) media upload popup. |
| 545 | * |
| 546 | * The dynamic portion of the hook, `$content_func`, refers to the form |
| 547 | * callback for the media upload type. Possible values include |
| 548 | * 'media_upload_type_form', 'media_upload_type_url_form', and |
| 549 | * 'media_upload_library_form'. |
| 550 | * |
| 551 | * @since 2.5.0 |
| 552 | */ |
| 553 | do_action( "admin_head_{$content_func}" ); |
| 554 | } |
| 555 | |
| 556 | $body_id_attr = ''; |
| 557 | if ( isset( $GLOBALS['body_id'] ) ) { |
| 558 | $body_id_attr = ' id="' . $GLOBALS['body_id'] . '"'; |
| 559 | } |
| 560 | ?> |
| 561 | </head> |
| 562 | <body<?php echo $body_id_attr; ?> class="wp-core-ui no-js"> |