The problem : when i used several 'choosecoursefile' element with an array of it, the return key of the value is for example : file[0] file[1] and not an array of file. The solution : The problem is in the 'MoodleQuickForm_choosecoursefile' class with the function 'exportValue' (file : \lib\form\choosecoursefile.php). The original code is : # function exportValue(&$submitValues, $assoc = false) { $value = null; $valuearray = $this->_elements[0]->exportValue($submitValues[$this->getName()], true); $value[$this->getName()]=$valuearray['value']; return $value; } # I proposed this modification wich works fine # function exportValue(&$submitValues, $assoc = false) { $value = null; $valuearray = $this->_elements[0]->exportValue($submitValues[$this->getName()], true); $name = $this->getName(); if (!strpos($name, '[')) { $value[$this->getName()]=$valuearray['value']; return $value; } else { $valueAry = array(); $myIndex = "['" . str_replace(array(']', '['), array('', "']['"), $name) . "']"; eval("\$valueAry$myIndex = \$valuearray['value'];"); return $valueAry; } } #