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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 |
|---|---|
| 3217 | |
| 3218 | /** |
| 3219 | * Filters the rel values that are added to links with `target` attribute. |
| 3220 | * |
| 3221 | * @since 5.1.0 |
| 3222 | * |
| 3223 | * @param string $rel The rel values. |
| 3224 | * @param string $link_html The matched content of the link tag including all HTML attributes. |
| 3225 | */ |
| 3226 | $rel = apply_filters( 'wp_targeted_link_rel', 'noopener', $link_html ); |
| 3227 | |
| 3228 | // Return early if no rel values to be added or if no actual target attribute. |
| 3229 | if ( ! $rel || ! isset( $atts['target'] ) ) { |
| 3230 | return "<a $original_link_html>"; |
| 3231 | } |
| 3232 | |
| 3233 | if ( isset( $atts['rel'] ) ) { |
| 3234 | $all_parts = preg_split( '/\s/', "{$atts['rel']['value']} $rel", -1, PREG_SPLIT_NO_EMPTY ); |
| 3235 | $rel = implode( ' ', array_unique( $all_parts ) ); |