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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 |
|---|---|
| 109 | * @since 4.7.0 |
| 110 | * |
| 111 | * @param int $post_id Post ID related to the trackback. |
| 112 | * @param string $trackback_url Trackback URL. |
| 113 | * @param string $charset Character set. |
| 114 | * @param string $title Trackback title. |
| 115 | * @param string $excerpt Trackback excerpt. |
| 116 | * @param string $blog_name Site name. |
| 117 | */ |
| 118 | do_action( 'pre_trackback_post', $post_id, $trackback_url, $charset, $title, $excerpt, $blog_name ); |
| 119 | |
| 120 | header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ) ); |
| 121 | |
| 122 | if ( ! pings_open( $post_id ) ) { |
| 123 | trackback_response( 1, __( 'Sorry, trackbacks are closed for this item.' ) ); |
| 124 | } |
| 125 | |
| 126 | $title = wp_html_excerpt( $title, 250, '…' ); |
| 127 | $excerpt = wp_html_excerpt( $excerpt, 252, '…' ); |