[介绍](php_intro.md.md) [环境安装](%E7%8E%AF%E5%A2%83%E5%AE%89%E8%A3%85.md) [Hello Word](HelloWord.md) [类型](%E7%B1%BB%E5%9E%8B.md) [运算符](%E8%BF%90%E7%AE%97%E7%AC%A6.md) [流程控制](%E6%B5%81%E7%A8%8B%E6%8E%A7%E5%88%B6.md) [函数](%E5%87%BD%E6%95%B0.md) [类与对象](%E7%B1%BB%E4%B8%8E%E5%AF%B9%E8%B1%A1.md) [常量](%E5%B8%B8%E9%87%8F.md) [命名空间](%E5%91%BD%E5%90%8D%E7%A9%BA%E9%97%B4.md) [static静态属性与静态方法](static%E9%9D%99%E6%80%81%E5%B1%9E%E6%80%A7%E4%B8%8E%E9%9D%99%E6%80%81%E6%96%B9%E6%B3%95.md)