private function writeTmpIni(array $iniFiles, $tmpDir, &$error)
    {
        if (!$this->tmpIni = @tempnam($tmpDir, '')) {
            return false;
        }

        // $iniFiles has at least one item and it may be empty
        if (empty($iniFiles[0])) {
            array_shift($iniFiles);
        }

        $content = '';
        $regex = '/^\s*(zend_extension\s*=.*xdebug.*)$/mi';

        foreach ($iniFiles as $file) {
            // Check for inaccessible ini files
            if (!$data = @file_get_contents($file)) {
                $error = 'Unable to read ini: '.$file;
                return false;
            }
            $content .= preg_replace($regex, ';$1', $data).PHP_EOL;
        }

        // Merge loaded settings into our ini content, if it is valid
        if ($config = parse_ini_string($content)) {
            $loaded = ini_get_all(null, false);
            $content .= $this->mergeLoadedConfig($loaded, $config);
        }

        // Work-around for https://bugs.php.net/bug.php?id=75932
        $content .= 'opcache.enable_cli=0'.PHP_EOL;

        return @file_put_contents($this->tmpIni, $content);
    }