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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 |
|---|---|
| 3057 | |
| 3058 | /** |
| 3059 | * Filters the rel values that are added to links with `target` attribute. |
| 3060 | * |
| 3061 | * @since 5.1.0 |
| 3062 | * |
| 3063 | * @param string The rel values. |
| 3064 | * @param string $link_html The matched content of the link tag including all HTML attributes. |
| 3065 | */ |
| 3066 | $rel = apply_filters( 'wp_targeted_link_rel', 'noopener noreferrer', $link_html ); |
| 3067 | |
| 3068 | // Avoid additional regex if the filter removes rel values. |
| 3069 | if ( ! $rel ) { |
| 3070 | return "<a $link_html>"; |
| 3071 | } |
| 3072 | |
| 3073 | // Value with delimiters, spaces around are optional. |
| 3074 | $attr_regex = '|rel\s*=\s*?(\\\\{0,1}["\'])(.*?)\\1|i'; |
| 3075 | preg_match( $attr_regex, $link_html, $rel_match ); |