function _linkchecker_link_replace in Link checker 5.2

Same name and namespace in other branches

1. 6.2 linkchecker.module \_linkchecker_link_replace()
2. 7 linkchecker.module \_linkchecker_link_replace()

Replaces old link with new link in text.

Parameters

$text: The text a link is inside. Passed in as a reference.

$old_link_fqdn: The old link to search for in strings.

$new_link_fqdn: The old link should be overwritten with this new link.

1 call to _linkchecker_link_replace()

_linkchecker_status_handling in ./linkchecker.module

Status code handling.

File

./linkchecker.module, line 1575

This module periodically check links in given node types, blocks, cck fields, etc.

Code

function _linkchecker_link_replace(&$text, $old_link_fqdn = '', $new_link_fqdn = '') {

  // Don't do any string replacement if one of the values is empty.
  if (!empty($text) && !empty($old_link_fqdn) && !empty($new_link_fqdn)) {

    // Remove protocols and hostname from local URLs.
    $base_roots = array(
      strtolower('http://' . $_SERVER['HTTP_HOST']),
      strtolower('https://' . $_SERVER['HTTP_HOST']),
    );
    $old_link = str_replace($base_roots, '', $old_link_fqdn);
    $new_link = str_replace($base_roots, '', $new_link_fqdn);

    // Build variables with all URLs and run check_url() only once.
    $old_html_link_fqdn = check_url($old_link_fqdn);
    $new_html_link_fqdn = check_url($new_link_fqdn);
    $old_html_link = check_url($old_link);
    $new_html_link = check_url($new_link);

    // Replace links in CCK link and text and Links weblink fields.
    if (in_array($text, array(
      $old_html_link_fqdn,
      $old_html_link,
      $old_link_fqdn,
      $old_link,
    ))) {

      // Keep old and new links in the same encoding and format and short or fully qualified.
      $text = str_replace($old_html_link_fqdn, $new_html_link_fqdn, $text);
      $text = str_replace($old_html_link, $new_html_link, $text);
      $text = str_replace($old_link_fqdn, $new_link_fqdn, $text);
      $text = str_replace($old_link, $new_link, $text);
    }
    else {

      // Create an array of preg quoted links with HTML decoded and encoded URLs.
      $old_links_quoted = array();
      $old_links_quoted[] = preg_quote($old_html_link_fqdn, '/');
      $old_links_quoted[] = preg_quote($old_html_link, '/');
      $old_links_quoted[] = preg_quote($old_link, '/');

      // Remove duplicate URLs from array if URLs do not have URL parameters.
      // If more than one URL parameter exists - one URL in the array will have
      // an unencoded ampersand "&" and a second URL will have an HTML encoded
      // ampersand "&".
      $regex_old_links = implode('|', array_unique($old_links_quoted));

      // Create array to fill with replacement rules.
      $replacements = array();

      // Add replace rules for a/area tags.
      if (variable_get('linkchecker_extract_from_a', 1) == 1) {

        // TODO: If link text between opening an closing a-tag having the same
        // URL, also replace the link text. Create a replace regex for this task.
        $text = str_replace(array(
          '>' . $old_html_link_fqdn . '</a>',
          '>' . $old_html_link . '</a>',
          '>' . $old_link . '</a>',
        ), '>' . $new_html_link . '</a>', $text);
        $replacements['/(<(a|area)\\s[^>]*href=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\4';
      }

      // Add replace rules for audio tags.
      if (variable_get('linkchecker_extract_from_audio', 0) == 1) {
        $replacements['/(<audio\\s[^>]*src=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
      }

      // Add replace rules for embed tags.
      if (variable_get('linkchecker_extract_from_embed', 0) == 1) {
        $replacements['/(<embed\\s[^>]*src=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
        $replacements['/(<embed\\s[^>]*pluginurl=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
        $replacements['/(<embed\\s[^>]*pluginspage=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
      }

      // Add replace rules for iframe tags.
      if (variable_get('linkchecker_extract_from_iframe', 0) == 1) {
        $replacements['/(<iframe\\s[^>]*src=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
      }

      // Add replace rules for img tags.
      if (variable_get('linkchecker_extract_from_img', 0) == 1) {
        $replacements['/(<img\\s[^>]*src=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
      }

      // Add replace rules for object/param tags.
      if (variable_get('linkchecker_extract_from_object', 0) == 1) {
        $replacements['/(<object\\s[^>]*data=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
        $replacements['/(<object\\s[^>]*codebase=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
        $replacements['/(<param\\s[^>]*((name|src)=["\'](archive|filename|href|movie|src|url)["\']\\s[^>]*)+value=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\6';
      }

      // Add replace rules for source tags.
      if (variable_get('linkchecker_extract_from_source', 0) == 1) {
        $replacements['/(<source\\s[^>]*src=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
      }

      // Add replace rules for video tags.
      if (variable_get('linkchecker_extract_from_video', 0) == 1) {
        $replacements['/(<video\\s[^>]*poster=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
        $replacements['/(<video\\s[^>]*src=["\'])(' . $regex_old_links . ')(["\'][^>]*>)/i'] = '\\1' . $new_html_link . '\\3';
      }

      // Replace link by applying all replacement rules on text.
      foreach ($replacements as $pattern => $replacement) {
        $text = preg_replace($pattern, $replacement, $text);
      }
    }
  }
}