Improvement: Get rid of a deprecation warning on PHP 8.2 and upwards

Author: abias

CHANGES.md

@@ -4,6 +4,10 @@ moodle-local_profilecohort
 Changes
 -------
 
+### Unreleased
+
+* 2025-10-31 - Improvement: Get rid of a deprecation warning on PHP 8.2 and upwards, resolves #66
+
 ### v4.5-r2
 
 * 2025-10-15 - Make codechecker happy again

classes/field_text.php

@@ -86,7 +86,7 @@ protected function __construct($ruledata = null) {
      */
     protected function matches_internal($value) {
         $value = strtolower(trim(strip_tags($value)));
-        $matchvalue = strtolower(trim($this->matchvalue));
+        $matchvalue = strtolower(trim($this->matchvalue ?? ''));
         switch ($this->matchtype) {
             case self::MATCH_NOTEXACT:
                 return ($value != $matchvalue);