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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 |
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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='$video_title' /></a> |
240 | <a href="{$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> |
241 | <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> |