就是mysql函数和mysqli函数的区别
PS：所有改成mysqli即可！！
PS：OK！！
参考：
mysql函数和mysqli函数用法详解_程序员的修养-CSDN博客
MySQL函数与MySQLi函数的区别 - 云虚拟主机 - 阿里云
PHP Fatal error: Uncaught Error: Call to undefined function mysql_fetch_array() in 报错的解决
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