PHP stack developers are highly sought after in the tech industry for their expertise in creating web applications and websites using the PHP programming language. To be successful in this field, you must be well-versed in the PHP language and web development tools, and have a good understanding of Linux systems, databases, and other web development technologies. PayScale reports that the average annual salary of a PHP stack developer is around $76,000, but this can range from $50,000 to $125,000 depending on experience and the employer.