VersionPress\Utils\WpConfigEditor::updateConfig PHP Method

    private function updateConfig($value, $replaceRegex, $definitionTemplate, $usePlainValue)
    {
        $wpConfigContent = file_get_contents($this->wpConfigPath);
        $phpizedValue = $usePlainValue ? $value : var_export($value, true);
        $configContainsDefinition = preg_match($replaceRegex, $wpConfigContent);
        if ($configContainsDefinition) {
            $wpConfigContent = preg_replace($replaceRegex, "\${1}{$phpizedValue}\${2}", $wpConfigContent);
        } else {
            $originalContent = $wpConfigContent;
            $endOfEditableSection = $this->isCommonConfig ? strlen($originalContent) : $this->findPositionForAddingNewDefinition($wpConfigContent);
            if ($endOfEditableSection === false) {
                throw new \Exception('Editable section not found.');
            }
            $wpConfigContent = substr($originalContent, 0, $endOfEditableSection);
            $wpConfigContent .= sprintf($definitionTemplate, $phpizedValue);
            $wpConfigContent .= substr($originalContent, $endOfEditableSection);
        }
        file_put_contents($this->wpConfigPath, $wpConfigContent);
    }