There are many advantages of hiring a PHP developer, including:
PHP is a widely used language for web development, so there is a large pool of potential developers to choose from.
PHP developers are relatively easy to find and hire compared to other languages such as Java or .NET.
PHP code is typically very easy to read and understand, making it easier for new developers to get up to speed quickly on an existing project.
Many popular web frameworks and content management systems (CMS) are written in PHP, so it can be helpful to have at least some familiarity with the language when working with these tools.