PHP是一种服务器端脚本语言(与传统的需要编写-编译-链接-运行（edit-compile-link-run）过程的计算机编程语言相对)
PHP supports the following data types: String, Integer, Float (floating point numbers - also called double), Boolean, Array, Object, NULL, Resource
也同样支持list, dict数据结构，只不过叫法不同，list叫array, dict叫associative array