求救,php+mysql有错

错误:Fatal error: Call to undefined function: mysql_connect() in /var/www/html/test.php3 on line 4, mysql可用,直接用php解析可以显示,数据表格 <html> <?php $db=mysql_connect("a104","root","971098"); mysql_select_db("test",$db); $result=mysql_query("SELECT * FROM teacher",$db); echo "hello\n"; echo "<table border=1>\n"; echo "<tr><td>id</td><td>name</td><td>address</td><td>year</td></tr>"; while($myrow=mysql_fetch_row($result)){ printf("<tr><td>%dtd><td>%s</td><td>%s</td><td>%s</td></tr>\n",$myrow[1],$myrow[2],$myrow[3],$myrow[4]); } echo "</table>\n"; ?> this is the end of the page!</html>[img][/img][img][/img][img][/img][img][/img]