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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 |
|---|---|
| 508 | * (pre-3.5.0) media upload popup. |
| 509 | * |
| 510 | * The dynamic portion of the hook, `$content_func`, refers to the form |
| 511 | * callback for the media upload type. Possible values include |
| 512 | * 'media_upload_type_form', 'media_upload_type_url_form', and |
| 513 | * 'media_upload_library_form'. |
| 514 | * |
| 515 | * @since 2.5.0 |
| 516 | */ |
| 517 | do_action( "admin_head_{$content_func}" ); |
| 518 | } |
| 519 | ?> |
| 520 | </head> |
| 521 | <body<?php if ( isset($GLOBALS['body_id']) ) echo ' id="' . $GLOBALS['body_id'] . '"'; ?> class="wp-core-ui no-js"> |
| 522 | <script type="text/javascript"> |
| 523 | document.body.className = document.body.className.replace('no-js', 'js'); |
| 524 | </script> |
| 525 | <?php |
| 526 | $args = func_get_args(); |