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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 |
|---|---|
| 478 | * (pre-3.5.0) media upload popup. |
| 479 | * |
| 480 | * The dynamic portion of the hook, $content_func, refers to the form |
| 481 | * callback for the media upload type. Possible values include |
| 482 | * 'media_upload_type_form', 'media_upload_type_url_form', and |
| 483 | * 'media_upload_library_form'. |
| 484 | * |
| 485 | * @since 2.5.0 |
| 486 | */ |
| 487 | do_action( "admin_head_{$content_func}" ); |
| 488 | } |
| 489 | ?> |
| 490 | </head> |
| 491 | <body<?php if ( isset($GLOBALS['body_id']) ) echo ' id="' . $GLOBALS['body_id'] . '"'; ?> class="wp-core-ui no-js"> |
| 492 | <script type="text/javascript"> |
| 493 | document.body.className = document.body.className.replace('no-js', 'js'); |
| 494 | </script> |
| 495 | <?php |
| 496 | $args = func_get_args(); |