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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 |
|---|---|
| 6839 | |
| 6840 | /** |
| 6841 | * Filters the pingback source URI. |
| 6842 | * |
| 6843 | * @since 3.6.0 |
| 6844 | * |
| 6845 | * @param string $pagelinkedfrom URI of the page linked from. |
| 6846 | * @param string $pagelinkedto URI of the page linked to. |
| 6847 | */ |
| 6848 | $pagelinkedfrom = apply_filters( 'pingback_ping_source_uri', $pagelinkedfrom, $pagelinkedto ); |
| 6849 | |
| 6850 | if ( ! $pagelinkedfrom ) { |
| 6851 | return $this->pingback_error( 0, __( 'A valid URL was not provided.' ) ); |
| 6852 | } |
| 6853 | |
| 6854 | // Check if the page linked to is on our site. |
| 6855 | $pos1 = strpos( $pagelinkedto, str_replace( array( 'http://www.', 'http://', 'https://www.', 'https://' ), '', get_option( 'home' ) ) ); |
| 6856 | if ( ! $pos1 ) { |
| 6857 | return $this->pingback_error( 0, __( 'Is there no link to us?' ) ); |