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Description

Callback to add a rel attribute to HTML A element.

Will remove already existing string before adding to prevent invalidating (X)HTML.

Usage

$string = wp_rel_callback( $matches, $rel );

Parameters

$matches

( array ) required – Single match.

$rel

( string ) required – The rel attribute to add.

Returns

string HTML A element with the added rel attribute.

Source

File name: wordpress/wp-includes/formatting.php
Lines:

function wp_rel_callback( $matches, $rel ) {
  $text = $matches[1];
  $atts = wp_kses_hair( $matches[1], wp_allowed_protocols() );

  if ( ! empty( $atts['href'] ) && wp_is_internal_link( $atts['href']['value'] ) ) {
    $rel = trim( str_replace( 'nofollow', '', $rel ) );
  }

  if ( ! empty( $atts['rel'] ) ) {
    $parts     = array_map( 'trim', explode( ' ', $atts['rel']['value'] ) );
    $rel_array = array_map( 'trim', explode( ' ', $rel ) );
    $parts     = array_unique( array_merge( $parts, $rel_array ) );
    $rel       = implode( ' ', $parts );
    unset( $atts['rel'] );

    $html = '';
    foreach ( $atts as $name => $value ) {
      if ( isset( $value['vless'] ) && 'y' === $value['vless'] ) {
        $html .= $name . ' ';
      } else {
        $html .= "{$name}=\"" . esc_attr( $value['value'] ) . '" ';
      }
    }
    $text = trim( $html );
  }

  $rel_attr = $rel ? ' rel="' . esc_attr( $rel ) . '"' : '';

  return "<a {$text}{$rel_attr}>";
}
 

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