Internal types

In this chapter we will detail the special types used internally by PHP.

Contents:

• Strings
  • The zend_string API
  • smart_str API
  • PHP’s custom printf functions
• The Resource type: zend_resource
  • What is the “Resource” type?
  • Resource types and resource destruction
  • Playing with resources
  • Reference counting resources
  • Persistent resources
• HashTables: zend_array
• Functions
  • PHP Callables