PHP连接mysql数据库报错:Call to undefined function mysql_connect()
2017-07-13 16:51
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问题描述
刚开始学php,系统环境是Ubuntu+PHP7.0+Mysql5.7+Apache2。运行一个数据库连接测试示例时报错:
[client 127.0.0.1:37496] PHP Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /var/www/html/test.php:2\nStack trace:\n#0 {main}\n thrown in /var/www/html/test.php on line 2
示例代码是:
<?PHP $conn=mysql_connect("localhost","root","root"); if($conn){ echo"ok"; }else{ echo"error"; } ?>
解决办法
查阅资料后发现,原来是从PHP5.0开始就不推荐使用mysql_connect()函数,到了php7.0则直接废弃了该函数,替代的函数是:mysqli_connect();
用法是:
$con=mysqli_connect("localhost","my_user","my_password","my_db");
官方的描述连接:http://php.net/manual/en/function.mysqli-connect.php
正确的测试代码:
<?PHP $conn=mysqli_connect("localhost","root","root"); if($conn){ echo"ok"; }else{ echo"error"; } ?>
总结
在Ubuntu+PHP7.0+Mysql5.7+Apache2的系统环境下报该错,是因为mysql_connect()函数被弃用了,当跟着过时的教程学习时可能会遇到该错误。(注意:如果是windows系统,则更可能是Apache2没有启用mysql,详情自行百度)当运行上面的测试代码时,界面上没有任何反应,错误是在日志中查阅出来的,日志目录在“/var/log/apache2/error.log”。
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