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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 |
|---|---|
| 3237 | */ |
| 3238 | function sanitize_trackback_urls( $to_ping ) { |
| 3239 | $urls_to_ping = preg_split( '/\r\n\t /', trim( $to_ping ), -1, PREG_SPLIT_NO_EMPTY ); |
| 3240 | foreach ( $urls_to_ping as $k => $url ) { |
| 3241 | if ( !preg_match( '#^https?://.#i', $url ) ) |
| 3242 | unset( $urls_to_ping[$k] ); |
| 3243 | } |
| 3244 | $urls_to_ping = array_map( 'esc_url_raw', $urls_to_ping ); |
| 3245 | $urls_to_ping = implode( "\n", $urls_to_ping ); |
| 3246 | return apply_filters( 'sanitize_trackback_urls', $urls_to_ping, $to_ping ); |
| 3247 | } |
| 3248 | |