PHP 编码规范(4)
3.4 缩进排版
4个空格常被作为缩进排版的一个单位。缩进的确切解释并未详细指定(空格 vs. 制表符)。一个制表符等于8个空格(而非4个)，所以在某些编辑器中，需要特别指定一下制表符的长度为4（UltraEdit），而在某些编辑器中，会将制表符转换为空格
3.5 行长度
尽量避免一行的长度超过80个字符，因为很多终端和工具不能很好处理之。
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