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Fatal error: Uncaught Error: Call to undefined怎么解决【办法】

Fatal error: Uncaught Error: Call to undefined function mysql_connect()【怎么解决办法】情况一Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /www/wwwroot/www.ygwzjs.cn/dg_upload/class/db_sql.php:72 Stack trace: #0 /www/wwwroot/www.ygwzjs.c...