wp_targeted_link_rel_callback( array $matches ): string

3357function wp_targeted_link_rel_callback( $matches ) {3358	_deprecated_function( __FUNCTION__, '6.7.0' );3359 3360	$link_html          = $matches[1];3361	$original_link_html = $link_html;3362 3363	// Consider the HTML escaped if there are no unescaped quotes.3364	$is_escaped = ! preg_match( '/(^|[^\\\\])[\'"]/', $link_html );3365	if ( $is_escaped ) {3366		// Replace only the quotes so that they are parsable by wp_kses_hair(), leave the rest as is.3367		$link_html = preg_replace( '/\\\\([\'"])/', '$1', $link_html );3368	}3369 3370	$atts = wp_kses_hair( $link_html, wp_allowed_protocols() );3371 3372	/**3373	 * Filters the rel values that are added to links with `target` attribute.3374	 *3375	 * @since 5.1.03376	 *3377	 * @param string $rel       The rel values.3378	 * @param string $link_html The matched content of the link tag including all HTML attributes.3379	 */3380	$rel = apply_filters( 'wp_targeted_link_rel', 'noopener', $link_html );3381 3382	// Return early if no rel values to be added or if no actual target attribute.3383	if ( ! $rel || ! isset( $atts['target'] ) ) {3384		return "<a $original_link_html>";3385	}3386 3387	if ( isset( $atts['rel'] ) ) {3388		$all_parts = preg_split( '/\s/', "{$atts['rel']['value']} $rel", -1, PREG_SPLIT_NO_EMPTY );3389		$rel       = implode( ' ', array_unique( $all_parts ) );3390	}3391 3392	$atts['rel']['whole'] = 'rel="' . esc_attr( $rel ) . '"';3393	$link_html            = implode( ' ', array_column( $atts, 'whole' ) );3394 3395	if ( $is_escaped ) {3396		$link_html = preg_replace( '/[\'"]/', '\\\\$0', $link_html );3397	}3398 3399	return "<a $link_html>";3400}