https://docs.zephir-lang.com/0.12/en/motivation
zephir是为开发PHP扩展而发明的一门语言，而且只能用来开发PHP扩展，通常，PHP的扩展都是编译运行的，但是zephir却是把自己编译成字节码给zend解释执行的，但是他也能进一步编译成机器语言
Zephir was not created to replace PHP or C. Instead, we think it is a complement to them, allowing PHP developers to venture into code compilation and static typing. Zephir is an attempt to join good things from the C and PHP worlds, looking for opportunities to make applications faster.
只能写带名字空间的class
Code in Zephir must be placed in classes. The language is intended to create object-oriented libraries/frameworks, so code outside of a class is not allowed. Additionally, a namespace is required:
他可以直接调用PHP语言定义的函数
必须写注释:
In most languages, comments are simply text ignored by the compiler/interpreter. In Zephir, multi-line comments are also used as docblocks, and they’re exported to the generated code, so they’re part of the language!
If a docblock is not located where it is expected, the compiler will throw an exception.
zephir相当于是跑在zend上的另一门语言