先看报错信息：<b>Fatal error</b>:  Uncaught Error: Call to undefined function mysql_connect() in I:\phpstudy_pro\WWW\wx\db\search.php:29

Stack trace:

#0 {main}

  thrown in <b>I:\phpstudy_pro\WWW\wx\db\search.php</b> on line <b>29</b><br />

再看php文件的29行：

// 连接数据库

$con = mysql_connect("localhost","admin","123123"); （这是29行，我是小白，弄不明白，求教！）

if (!$con){die('Could not connect: ' . mysql_error());}

mysql_select_db("joblist", $con);

mysql_query("SET NAMES UTF8");

//查询数据库

$result = mysql_query("SELECT * FROM job WHERE 需要查询的字段 like '%$keyword3%' ORDER BY ID DESC");

$results = array();