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After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：PHP data type string
单引号与双引号之间的区别 1.双 解析变量 单（不） 2.双里面插入变量后有英文或中文字符 变量和字符将拼接（看做）
2018-07-200个赞
