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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 |
|---|---|
| 389 | if ( $do_image ) |
| 390 | $out .= _media_button(__('Add an Image'), 'images/media-button-image.gif?ver=20100531', 'image'); |
| 391 | if ( $do_video ) |
| 392 | $out .= _media_button(__('Add Video'), 'images/media-button-video.gif?ver=20100531', 'video'); |
| 393 | if ( $do_audio ) |
| 394 | $out .= _media_button(__('Add Audio'), 'images/media-button-music.gif?ver=20100531', 'audio'); |
| 395 | |
| 396 | $out .= _media_button(__('Add Media'), 'images/media-button-other.gif?ver=20100531', 'media'); |
| 397 | |
| 398 | $context = apply_filters('media_buttons_context', __('Upload/Insert %s')); |
| 399 | |
| 400 | printf($context, $out); |
| 401 | } |
| 402 | add_action( 'media_buttons', 'media_buttons' ); |
| 403 | |
| 404 | function _media_button($title, $icon, $type) { |
| 405 | return "<a href='" . esc_url( get_upload_iframe_src($type) ) . "' id='add_$type' class='thickbox' title='$title'><img src='" . esc_url( admin_url( $icon ) ) . "' alt='$title' onclick='return false;' /></a>"; |
| 406 | } |
| 407 | |