function validation($data)
{
global $USER;
$errorlog = array();
$form_errorlog = $this->_form->_errors;
$user = CoursePrefsUser::findByUnique($USER->username);
$courses = $user->getCoursesAsTeacher();
$this->course_create = array();
$this->course_enroll = array();
$enroll_default = CoursePrefsConfig::getNamedValue('course_enroll_days');
$create_default = CoursePrefsConfig::getNamedValue('course_create_days');
// Parse form submission and glean necessary information
foreach ($data as $key => $value) {
$matches = array();
if (preg_match(CREATE_DAYS_PATTERN, $key, $matches) && $courses[$matches[2]]) {
if (!$this->course_create[$matches[1]]) {
$this->course_create[$matches[1]] = array();
}
$this->course_create[$matches[1]][$matches[2]] = $value;
} else {
if (preg_match(ENROLL_DAYS_PATTERN, $key, $matches) && $courses[$matches[2]]) {
if (!$this->course_enroll[$matches[1]]) {
$this->course_enroll[$matches[1]] = array();
}
$this->course_enroll[$matches[1]][$matches[2]] = $value;
}
}
}
// Iterate over semesters and check course-specific settings are valid
foreach ($this->course_create as $semestersid => $courses) {
// Check whether the courses' creation value is greater than or equal to its enrollment value
foreach ($courses as $coursesid => $value) {
/*// Skip course if either of its create or enroll fields weren't submitted properly
if ($form_errorlog[$semestersid . CREATE_DAYS_FIELD . $coursesid] ||
$form_errorlog[$semestersid . ENROLL_DAYS_FIELD . $coursesid]) {
continue;
}*/
$course_create_days = $this->course_create[$semestersid][$coursesid];
$course_enroll_days = $this->course_enroll[$semestersid][$coursesid];
if ($course_create_days === '0' || $course_enroll_days === '0') {
unset($this->course_enroll[$semestersid][$coursesid]);
unset($this->course_create[$semestersid][$coursesid]);
$errorlog[$semestersid . COURSE_GROUP . $coursesid] = get_string('err_negative_number', 'block_courseprefs');
continue;
}
if ($course_create_days == '') {
$this->course_create[$semestersid][$coursesid] = $create_default;
}
if ($course_enroll_days == '') {
$this->course_enroll[$semestersid][$coursesid] = $enroll_default;
}
/*
if ($course_create_days == '' && $course_enroll_days != '') {
$a->name = 'Create';
$errorlog[$semestersid . COURSE_GROUP . $coursesid] = get_string('err_days_invalid', 'block_courseprefs', $a);
} else if ($course_enroll_days == '' && $course_create_days!='') {
$a->name = 'Enroll';
$errorlog[$semestersid . COURSE_GROUP . $coursesid] = get_string('err_days_invalid', 'block_courseprefs', $a);
}
*/
// Log an error if the course's enrollment value is greater than the creation value
if ($course_create_days < $course_enroll_days) {
$errorlog[$semestersid . COURSE_GROUP . $coursesid] = get_string('err_create_enroll_compare', 'block_courseprefs');
}
}
}
return $errorlog;
}
