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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 |
|---|---|
| 6215 | |
| 6216 | /** |
| 6217 | * Filter the pingback source URI. |
| 6218 | * |
| 6219 | * @since 3.6.0 |
| 6220 | * |
| 6221 | * @param string $pagelinkedfrom URI of the page linked from. |
| 6222 | * @param string $pagelinkedto URI of the page linked to. |
| 6223 | */ |
| 6224 | $pagelinkedfrom = apply_filters( 'pingback_ping_source_uri', $pagelinkedfrom, $pagelinkedto ); |
| 6225 | |
| 6226 | if ( ! $pagelinkedfrom ) |
| 6227 | return $this->pingback_error( 0, __( 'A valid URL was not provided.' ) ); |
| 6228 | |
| 6229 | // Check if the page linked to is in our site |
| 6230 | $pos1 = strpos($pagelinkedto, str_replace(array('http://www.','http://','https://www.','https://'), '', get_option('home'))); |
| 6231 | if ( !$pos1 ) |
| 6232 | return $this->pingback_error( 0, __( 'Is there no link to us?' ) ); |
| 6233 | |