How do I enable opcache with PHP 5.3?

Question

For various reasons, I can't upgrade PHP to 5.5. I have PHP 5.3, is there a way to do opcode caching with 5.3?

Answer 1

From PHP docs:

This extension is bundled with PHP 5.5.0 and later, and is » available in PECL for PHP versions 5.2, 5.3 and 5.4.