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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 |
|---|---|
| 336 | */ |
| 337 | function media_buttons() { |
| 338 | global $post_ID, $temp_ID; |
| 339 | $uploading_iframe_ID = (int) (0 == $post_ID ? $temp_ID : $post_ID); |
| 340 | $context = apply_filters('media_buttons_context', __('Upload/Insert %s')); |
| 341 | $media_upload_iframe_src = "media-upload.php?post_id=$uploading_iframe_ID"; |
| 342 | $media_title = __('Add Media'); |
| 343 | $image_upload_iframe_src = apply_filters('image_upload_iframe_src', "$media_upload_iframe_src&type=image"); |
| 344 | $image_title = __('Add an Image'); |
| 345 | $video_upload_iframe_src = apply_filters('video_upload_iframe_src', "$media_upload_iframe_src&type=video"); |
| 346 | $video_title = __('Add Video'); |
| 347 | $audio_upload_iframe_src = apply_filters('audio_upload_iframe_src', "$media_upload_iframe_src&type=audio"); |
| 348 | $audio_title = __('Add Audio'); |
| 349 | $out = <<<EOF |
| 350 | |
| 351 | <a href="{$image_upload_iframe_src}&TB_iframe=true" id="add_image" class="thickbox" title='$image_title'><img src='images/media-button-image.gif' alt='$image_title' /></a> |
| 352 | <a href="{$video_upload_iframe_src}&TB_iframe=true" id="add_video" class="thickbox" title='$video_title'><img src='images/media-button-video.gif' alt='$video_title' /></a> |
| 353 | <a href="{$audio_upload_iframe_src}&TB_iframe=true" id="add_audio" class="thickbox" title='$audio_title'><img src='images/media-button-music.gif' alt='$audio_title' /></a> |
| 354 | <a href="{$media_upload_iframe_src}&TB_iframe=true" id="add_media" class="thickbox" title='$media_title'><img src='images/media-button-other.gif' alt='$media_title' /></a> |