fix

blog/php-mysql/index.md

@@ -60,7 +60,7 @@
 
 [流程结构 if while](blog/php-mysql/sql-if-while.md)
 
-[函数 function](blog/php-mysql/sql-function.md)
+[内置函数和自定义函数 function](blog/php-mysql/sql-function.md)
 
 [存储过程 procedure](blog/php-mysql/sql-procedure.md)
 

blog/php-mysql/sql-function.md

-# 函数 function
+# 内置函数和自定义函数 function
 
 函数分为两类：系统函数和自定义函数
 
@@ -19,9 +19,12 @@ length  | 判断字符串的字节数,与字符集有关
 concat | 连接字符串
 insrt  |  检查字符是否在目标字符串中，存在返回其位置，不存在返回 0
 lcase | 全部小写
-left   | 左侧开始截取字符串，直到指定位置
 ltrim |  消除左边的空格
+left(str, length)  | 左侧开始截取字符串，直到指定位置
+right(str, length) |  右侧开始截取字符串，直到指定位置
 mid  |  从中间指定位置开始截取，如果不指定截取长度，直接到最后
+`substring(str, index, [length]`) | 从指定位置开始，指定截取长度
+substring_index(str, delim, count) | 按照关键字截取
 
 示例
 
@@ -39,9 +42,15 @@ select instr('你好中国', '我'); // 0
 
 select lcase('aBcd'); // abcd
 select left('aBcd', 2); // aB
+select right('abcdef', 2); // ef
+select substring('abcdef', 2, 3); // bcd
+select substring('abcdef', -2, 3); // ef
 
 select ltrim(' abc d '); // abc d
 select mid('你好中国', 3); // 中国
+
+select substring_index('www.baidu.com', '.', 2); // www.baidu
+select substring_index('www.baidu.com', '.', -2); // baidu.com
 ```
 
 ### 1.2、时间函数

index.html

@@ -18,6 +18,15 @@
           href="static/js/vue@4.12.2.min.css">
 
     <style>
+        :root {
+            --toc-width: 300px;
+        }
+
+        /* 左侧导航 */
+        .sidebar {
+            width: 220px;
+        }
+
         /* 更新时间 */
         .last-update-time-wrap {
             padding: 20px 0;
@@ -33,7 +42,29 @@
         /* 右侧目录 */
         .page_toc {
             margin-top: 20px;
+            max-height: calc(100vh - 100px);
+            overflow-y: auto;
+            /* height: 100px; */
+        }
+
+        .page_toc::-webkit-scrollbar {
+            width: 4px
+        }
+
+        .page_toc::-webkit-scrollbar-thumb {
+            background: 0 0;
+            border-radius: 4px
         }
+
+        .page_toc:hover::-webkit-scrollbar-thumb {
+            background: hsla(0, 0%, 53.3%, .4)
+        }
+
+        .page_toc:hover::-webkit-scrollbar-track {
+            background: hsla(0, 0%, 53.3%, .1)
+        }
+
+       
     </style>
 </head>
 
@@ -85,12 +116,16 @@
     <script src="static/js/prism-bash.min.js"></script>
     <script src="static/js/prism-php.min.js"></script>
     <script src="static/js/prism-sql.min.js"></script>
+    <script src="static/js/prism-python.min.js"></script>
     <script src="static/js/prism-json@1.26.0.min.js"></script>
 
     <script src="static/js/search@4.12.2.min.js"></script>
     <script src="static/js/docsify-copy-code@2.1.1.min.js"></script>
     <script src="static/js/time-updater@1.min.js"></script>
 
+    <!-- 下载地址 -->
+    <!-- https://cdn.jsdelivr.net/npm/prismjs@1/components/prism-python.min.js-->
+
     <link rel="stylesheet"
           href="static/js/toc.css">
     <script src="static/js/toc.js"></script>

static/js/prism-python.min.js

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