报错：Fatal error: Uncaught Error: Call to undefined function mysql_connect() in 和php网站打开一片空白【解决】

 

mysql_connect()这个函数再也不使用

 

 不要修改php.ini文件，改为mysqli_connect()就能够了

全局替换后

报错：Warning: mysqli_error() expects exactly 1 parameter, 0 given in

$con = mysqli_connect( $dbhost, $dbuser, $dbpass ); if ( !$con ) { die( '数据库连接出错，请检查帐号密码及地址是否正确: ' . mysqli_error() ); }

以前开了数据库端口，从新改成3306后：

 

原代码：

$con = mysql_connect( $dbhost, $dbuser, $dbpass ); if ( !$con ) { die( '数据库连接出错，请检查帐号密码及地址是否正确: ' . mysql_error() ); } $result = mysql_query('show databases;') or die ( mysql_error() );; While($row = mysql_fetch_assoc($result)){ $data[] = $row['Database']; } unset($result, $row); if (in_array(strtolower($dbname), $data)){ mysql_close(); echo "<script>if(!alert('數據庫已存在')){window.history.back(-1);}</script>"; exit(); } mysql_query( "CREATE DATABASE $dbname", $con ) or die ( mysql_error() );

修改成

 $con = mysqli_connect( $dbhost, $dbuser, $dbpass ); if ( !$con ) { die( '数据库连接出错，请检查帐号密码及地址是否正确: ' . mysqli_error() ); } $result = mysqli_query($con,'show databases;') or die ( mysqli_error($con) );; While($row = mysqli_fetch_assoc($result)){ $data[] = $row['Database']; } unset($result, $row); if (in_array(strtolower($dbname), $data)){ mysqli_close(); echo "<script>if(!alert('數據庫已存在')){window.history.back(-1);}</script>"; exit(); } mysqli_query( $con,"CREATE DATABASE $dbname" ) or die ( mysqli_error($con) );

数据库链接成功

 

 

通过已上安装成功后，点击确认，而后页面一片空白：

 

检查配置文件，猜想是配置文件配置不正确致使 ，

参考：https://help.aliyun.com/knowledge_detail/36451.html

 

先查看配置文件，

<?php error_reporting(0); if (!file_exists($_SERVER["DOCUMENT_ROOT"] . '/sys/install.lock')) { header("Location: /install/install.php"); exit; } include_once '../sys/lib.php'; $host = "localhost"; $username = "root"; $password = "root"; $database = "vauditdemo"; $conn = mysql_connect($host, $username, $password); mysql_query('set names utf8', $conn); mysql_select_db($database, $conn) or die(mysql_error()); if (!$conn) { die('Could not connect: ' . mysql_error()); exit; } session_start(); ?>

修改成：

<?php

error_reporting(0);

if (!file_exists($_SERVER["DOCUMENT_ROOT"] . '/sys/install.lock')) {
    header("Location: /install/install.php");
    exit;
}

include_once '../sys/lib.php';

$host = "localhost";
$username = "root";
$password = "root";
$database = "vauditdemo";

$conn = mysqli_connect($host, $username, $password);
mysqli_query('set names utf8', $conn);
mysqli_select_db($conn,$database) or die(mysqli_error());
if (!$conn) {
    die('Could not connect: ' . mysqli_error());
    exit;
}

session_start();

?>

打开成功：