文件规范
<span style="color: rgb(82, 82, 82); font-family: NotoSansHans-Regular, AvenirNext-Regular, arial, "Hiragino Sans GB", "Microsoft Yahei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif; font-size: 15px;">一份 PHP 文件中 </span><strong style="box-sizing: border-box; color: rgb(82, 82, 82); font-family: NotoSansHans-Regular, AvenirNext-Regular, arial, "Hiragino Sans GB", "Microsoft Yahei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif; font-size: 15px;">应该</strong><span style="color: rgb(82, 82, 82); font-family: NotoSansHans-Regular, AvenirNext-Regular, arial, "Hiragino Sans GB", "Microsoft Yahei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif; font-size: 15px;"> 要不就只定义新的声明，如类、函数或常量等不产生 </span><font color="#858080" face="monaco, Consolas, Liberation Mono, Menlo, Courier, monospace"><span style="font-size: 11.7px; background-color: rgb(249, 250, 250);">副作用</span></font><span style="color: rgb(82, 82, 82); font-family: NotoSansHans-Regular, AvenirNext-Regular, arial, "Hiragino Sans GB", "Microsoft Yahei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif; font-size: 15px;"> 的操作，要不就只书写会产生 </span><code style="box-sizing: border-box; font-family: monaco, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 0.9em; padding: 1px 2px; color: rgb(133, 128, 128); background: rgb(249, 250, 250); border-radius: 4px; margin: 5px; border: 1px solid rgb(228, 228, 228); max-width: 740px; overflow-x: auto;">副作用</code><span style="color: rgb(82, 82, 82); font-family: NotoSansHans-Regular, AvenirNext-Regular, arial, "Hiragino Sans GB", "Microsoft Yahei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif; font-size: 15px;"> 的逻辑操作，但 </span><strong style="box-sizing: border-box; color: rgb(82, 82, 82); font-family: NotoSansHans-Regular, AvenirNext-Regular, arial, "Hiragino Sans GB", "Microsoft Yahei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif; font-size: 15px;">不该</strong><span style="color: rgb(82, 82, 82); font-family: NotoSansHans-Regular, AvenirNext-Regular, arial, "Hiragino Sans GB", "Microsoft Yahei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif; font-size: 15px;"> 同时具有两者。</span><span style="color: rgb(82, 82, 82); font-family: NotoSansHans-Regular, AvenirNext-Regular, arial, "Hiragino Sans GB", "Microsoft Yahei", "Hiragino Sans GB", "WenQuanYi Micro Hei", sans-serif; font-size: 15px;">「副作用」(side effects) 一词的意思是，仅仅通过包含文件，不直接声明类、函数和常量等，而执行的逻辑操作。</span>
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