Description: ------------ There was another error report about this but I do not believe the issue has been properly dealt with. The problem exists because the operator being used does not relate correctly to the var type. The class declares $this->_errors as an array and so at least for consistency it should be treated as such in a consistent way. Thus the operator used to append to the $this->_errors array should be [] and not +=. Doing otherwise is also confusing because it breaks the way the other validation methods are written - it doesn't seem consistent to me. Here is my report: On line 1290 of QuickForm.php there is an error which causes an unsupported operands error in php. line 1290: $this->_errors += $res; The += operator is incorrectly used here - it is a string operator. $this->_errors is an array so the line should read instead: line 1290: $this->_errors[$elementName] = $res; This is part of the validate() method. Reproduce code: --------------- // process the global rules now foreach ($this->_formRules as $rule) { if (true !== ($res = call_user_func($rule, $this->_submitValues, $this->_submitFiles))) { $this->_errors += $res; } } Expected result: ---------------- There should be no error generated by php. Actual result: -------------- Fatal error: Unsupported operand types in /home/client/php/PEAR/HTML/QuickForm.php on line 1290