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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 |
|---|---|
| 221 | <?php |
| 222 | } |
| 223 | |
| 224 | function media_buttons() { |
| 225 | global $post_ID, $temp_ID; |
| 226 | $uploading_iframe_ID = (int) (0 == $post_ID ? $temp_ID : $post_ID); |
| 227 | $context = apply_filters('media_buttons_context', __('Add media: %s')); |
| 228 | $media_upload_iframe_src = "media-upload.php?post_id=$uploading_iframe_ID"; |
| 229 | $media_title = __('Add Media'); |
| 230 | $image_upload_iframe_src = apply_filters('image_upload_iframe_src', "$media_upload_iframe_src&type=image"); |
| 231 | $image_title = __('Add an Image'); |
| 232 | $video_upload_iframe_src = apply_filters('video_upload_iframe_src', "$media_upload_iframe_src&type=video"); |
| 233 | $video_title = __('Add Video'); |
| 234 | $audio_upload_iframe_src = apply_filters('audio_upload_iframe_src', "$media_upload_iframe_src&type=audio"); |
| 235 | $audio_title = __('Add Audio'); |
| 236 | $out = <<<EOF |
| 237 | |
| 238 | <a href="{$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> |
| 239 | <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> |