Symfony\Component\DependencyInjection\Dumper\PhpDumper::addNewInstance PHP Method

    private function addNewInstance(Definition $definition, $return, $instantiation, $id)
    {
        $class = $this->dumpValue($definition->getClass());

        $arguments = array();
        foreach ($definition->getArguments() as $value) {
            $arguments[] = $this->dumpValue($value);
        }

        if (null !== $definition->getFactory()) {
            $callable = $definition->getFactory();
            if (is_array($callable)) {
                if (!preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $callable[1])) {
                    throw new RuntimeException(sprintf('Cannot dump definition because of invalid factory method (%s)', $callable[1] ?: 'n/a'));
                }

                if ($callable[0] instanceof Reference
                    || ($callable[0] instanceof Definition && $this->definitionVariables->contains($callable[0]))) {
                    return sprintf("        $return{$instantiation}%s->%s(%s);\n", $this->dumpValue($callable[0]), $callable[1], $arguments ? implode(', ', $arguments) : '');
                }

                $class = $this->dumpValue($callable[0]);
                // If the class is a string we can optimize call_user_func away
                if (0 === strpos($class, "'") && false === strpos($class, '$')) {
                    if ("''" === $class) {
                        throw new RuntimeException(sprintf('Cannot dump definition: The "%s" service is defined to be created by a factory but is missing the service reference, did you forget to define the factory service id or class?', $id));
                    }

                    return sprintf("        $return{$instantiation}%s::%s(%s);\n", $this->dumpLiteralClass($class), $callable[1], $arguments ? implode(', ', $arguments) : '');
                }

                if (0 === strpos($class, 'new ')) {
                    return sprintf("        $return{$instantiation}(%s)->%s(%s);\n", $this->dumpValue($callable[0]), $callable[1], $arguments ? implode(', ', $arguments) : '');
                }

                return sprintf("        $return{$instantiation}call_user_func(array(%s, '%s')%s);\n", $this->dumpValue($callable[0]), $callable[1], $arguments ? ', '.implode(', ', $arguments) : '');
            }

            return sprintf("        $return{$instantiation}%s(%s);\n", $this->dumpLiteralClass($this->dumpValue($callable)), $arguments ? implode(', ', $arguments) : '');
        }

        if (false !== strpos($class, '$')) {
            return sprintf("        \$class = %s;\n\n        $return{$instantiation}new \$class(%s);\n", $class, implode(', ', $arguments));
        }

        return sprintf("        $return{$instantiation}new %s(%s);\n", $this->dumpLiteralClass($class), implode(', ', $arguments));
    }