Contao\DC_Table::save PHP Method

    protected function save($varValue)
    {
        if (\Input::post('FORM_SUBMIT') != $this->strTable) {
            return;
        }
        $arrData = $GLOBALS['TL_DCA'][$this->strTable]['fields'][$this->strField];
        // Convert date formats into timestamps
        if ($varValue != '' && in_array($arrData['eval']['rgxp'], array('date', 'time', 'datim'))) {
            $objDate = new \Date($varValue, \Date::getFormatFromRgxp($arrData['eval']['rgxp']));
            $varValue = $objDate->tstamp;
        }
        // Make sure unique fields are unique
        if ($arrData['eval']['unique'] && $varValue != '' && !$this->Database->isUniqueValue($this->strTable, $this->strField, $varValue, $this->objActiveRecord->id)) {
            throw new \Exception(sprintf($GLOBALS['TL_LANG']['ERR']['unique'], $arrData['label'][0] ?: $this->strField));
        }
        // Handle multi-select fields in "override all" mode
        if (\Input::get('act') == 'overrideAll' && ($arrData['inputType'] == 'checkbox' || $arrData['inputType'] == 'checkboxWizard') && $arrData['eval']['multiple']) {
            if ($this->objActiveRecord !== null) {
                $new = \StringUtil::deserialize($varValue, true);
                $old = \StringUtil::deserialize($this->objActiveRecord->{$this->strField}, true);
                // Call load_callback
                if (is_array($GLOBALS['TL_DCA'][$this->strTable]['fields'][$this->strField]['load_callback'])) {
                    foreach ($GLOBALS['TL_DCA'][$this->strTable]['fields'][$this->strField]['load_callback'] as $callback) {
                        if (is_array($callback)) {
                            $this->import($callback[0]);
                            $old = $this->{$callback[0]}->{$callback[1]}($old, $this);
                        } elseif (is_callable($callback)) {
                            $old = $callback($old, $this);
                        }
                    }
                }
                switch (\Input::post($this->strInputName . '_update')) {
                    case 'add':
                        $varValue = array_values(array_unique(array_merge($old, $new)));
                        break;
                    case 'remove':
                        $varValue = array_values(array_diff($old, $new));
                        break;
                    case 'replace':
                        $varValue = $new;
                        break;
                }
                if (!is_array($varValue) || empty($varValue)) {
                    $varValue = \Widget::getEmptyStringOrNullByFieldType($arrData['sql']);
                } elseif (isset($arrData['eval']['csv'])) {
                    $varValue = implode($arrData['eval']['csv'], $varValue);
                    // see #2890
                } else {
                    $varValue = serialize($varValue);
                }
            }
        }
        // Convert arrays (see #2890)
        if ($arrData['eval']['multiple'] && isset($arrData['eval']['csv'])) {
            $varValue = implode($arrData['eval']['csv'], \StringUtil::deserialize($varValue, true));
        }
        // Trigger the save_callback
        if (is_array($arrData['save_callback'])) {
            foreach ($arrData['save_callback'] as $callback) {
                if (is_array($callback)) {
                    $this->import($callback[0]);
                    $varValue = $this->{$callback[0]}->{$callback[1]}($varValue, $this);
                } elseif (is_callable($callback)) {
                    $varValue = $callback($varValue, $this);
                }
            }
        }
        // Save the value if there was no error
        if (($varValue != '' || !$arrData['eval']['doNotSaveEmpty']) && ($this->varValue !== $varValue || $arrData['eval']['alwaysSave'])) {
            // If the field is a fallback field, empty all other columns (see #6498)
            if ($arrData['eval']['fallback'] && $varValue != '') {
                if ($GLOBALS['TL_DCA'][$this->strTable]['list']['sorting']['mode'] == 4) {
                    $this->Database->prepare("UPDATE " . $this->strTable . " SET " . $this->strField . "='' WHERE pid=?")->execute($this->activeRecord->pid);
                } else {
                    $this->Database->execute("UPDATE " . $this->strTable . " SET " . $this->strField . "=''");
                }
            }
            // Set the correct empty value (see #6284, #6373)
            if ($varValue === '') {
                $varValue = \Widget::getEmptyValueByFieldType($GLOBALS['TL_DCA'][$this->strTable]['fields'][$this->strField]['sql']);
            }
            $arrValues = $this->values;
            array_unshift($arrValues, $varValue);
            $objUpdateStmt = $this->Database->prepare("UPDATE " . $this->strTable . " SET " . $this->strField . "=? WHERE " . implode(' AND ', $this->procedure))->execute($arrValues);
            if ($objUpdateStmt->affectedRows) {
                $this->blnCreateNewVersion = true;
                $this->varValue = \StringUtil::deserialize($varValue);
                if (is_object($this->objActiveRecord)) {
                    $this->objActiveRecord->{$this->strField} = $this->varValue;
                }
            }
        }
    }