function question_find_file_links_from_html($html, $courseid)
{
global $CFG;
$baseurl = question_file_links_base_url($courseid);
$searchfor = '!' . '(<\\s*(a|img)\\s[^>]*(href|src)\\s*=\\s*")' . $baseurl . '([^"]*)"' . '|' . '(<\\s*(a|img)\\s[^>]*(href|src)\\s*=\\s*\')' . $baseurl . '([^\']*)\'' . '!i';
$matches = array();
$no = preg_match_all($searchfor, $html, $matches);
if ($no) {
$rawurls = array_filter(array_merge($matches[5], $matches[10]));
//array_filter removes empty elements
//remove any links that point somewhere they shouldn't
foreach (array_keys($rawurls) as $rawurlkey) {
if (!($cleanedurl = question_url_check($rawurls[$rawurlkey]))) {
unset($rawurls[$rawurlkey]);
} else {
$rawurls[$rawurlkey] = $cleanedurl;
}
}
$urls = array_flip($rawurls);
// array_flip removes duplicate files
// and when we merge arrays will continue to automatically remove duplicates
} else {
$urls = array();
}
return $urls;
}
function find_file_links($question, $courseid)
{
$urls = array();
/// Question image
if ($question->image != '') {
if (substr(strtolower($question->image), 0, 7) == 'http://') {
$matches = array();
//support for older questions where we have a complete url in image field
if (preg_match('!^' . question_file_links_base_url($courseid) . '(.*)!i', $question->image, $matches)) {
if ($cleanedurl = question_url_check($urls[$matches[2]])) {
$urls[$cleanedurl] = null;
}
}
} else {
if ($question->image != '') {
if ($cleanedurl = question_url_check($question->image)) {
$urls[$cleanedurl] = null;
//will be set later
}
}
}
}
/// Questiontext and general feedback.
$urls += question_find_file_links_from_html($question->questiontext, $courseid);
$urls += question_find_file_links_from_html($question->generalfeedback, $courseid);
/// Answers, if this question uses them.
if (isset($question->options->answers)) {
foreach ($question->options->answers as $answerkey => $answer) {
/// URLs in the answers themselves, if appropriate.
if ($this->has_html_answers()) {
$urls += question_find_file_links_from_html($answer->answer, $courseid);
}
/// URLs in the answer feedback.
$urls += question_find_file_links_from_html($answer->feedback, $courseid);
}
}
/// Set all the values of the array to the question object
if ($urls) {
$urls = array_combine(array_keys($urls), array_fill(0, count($urls), array($question->id)));
}
return $urls;
}
function find_file_links($question, $courseid)
{
$urls = array();
if ($question->options->backgroundmedia->media != '') {
if (substr(strtolower($question->options->backgroundmedia->media), 0, 7) == 'http://') {
$matches = array();
//support for older questions where we have a complete url in image field
if (preg_match('!^' . question_file_links_base_url($courseid) . '(.*)!i', $question->options->backgroundmedia->media, $matches)) {
if ($cleanedurl = question_url_check($urls[$matches[2]])) {
$urls[$cleanedurl] = null;
}
}
} else {
if ($question->options->backgroundmedia->media != '') {
if ($cleanedurl = question_url_check($question->options->backgroundmedia->media)) {
$urls[$cleanedurl] = null;
//will be set later
}
}
}
}
foreach ($question->options->media as $media) {
if ($media->media != '') {
if (substr(strtolower($media->media), 0, 7) == 'http://') {
$matches = array();
if (preg_match('!^' . question_file_links_base_url($courseid) . '(.*)!i', $media->media, $matches)) {
if ($cleanedurl = question_url_check($urls[$matches[2]])) {
$urls[$cleanedurl] = null;
}
}
} else {
if ($media->media != '') {
if ($cleanedurl = question_url_check($media->media)) {
$urls[$cleanedurl] = null;
//will be set later
}
}
}
}
$urls += question_find_file_links_from_html($media->questiontext, $courseid);
}
$urls += question_find_file_links_from_html($question->options->feedbackok, $courseid);
$urls += question_find_file_links_from_html($question->options->feedbackmissed, $courseid);
//set all the values of the array to the question object
if ($urls) {
$urls = array_combine(array_keys($urls), array_fill(0, count($urls), array($question->id)));
}
$urls = array_merge_recursive($urls, parent::find_file_links($question, $courseid));
return $urls;
}
