批量修改mysql表前缀

<?php
header('Content-Type: text/html; charset=utf-8');
//设置好相关信息
$dbserver='127.0.0.1';//连接的服务器一般为localhost
$dbname='test';//数据库名
$dbuser='root';//数据库用户名
$dbpassword='root';//数据库密码
$old_prefix='ts_';//数据库的前缀
$new_prefix='new_';//数据库的前缀修改为
$conn = mysqli_connect($dbserver,$dbuser,$dbpassword);
if ( !is_string($dbname) || !is_string($old_prefix)|| !is_string($new_prefix) ){
    return false;
}

if (!mysqli_connect($dbserver, $dbuser, $dbpassword)) {
    print 'Could not connect to mysql';
    exit;
}
//取得数据库内所有的表名
mysqli_select_db($conn,$dbname);

//$result = mysqli_list_tables($dbname);
$result = mysqli_query($conn,"show tables");
if (!$result){
    print "DB Error, could not list tablesn";

    exit;
}
//把表名存进$data
while ($row = mysqli_fetch_row($result)) {
    $data[] = $row[0];
}
//过滤要修改前缀的表名
foreach($data as $k => $v){
    $preg = preg_match("/^($old_prefix{1})([a-zA-Z0-9_-]+)/i", $v, $v1);
    if($preg){
        $tab_name[$k] = $v1[2];
    }
}
if($preg){
    foreach($tab_name as $k => $v){
        $sql = 'RENAME TABLE `'.$old_prefix.$v.'` TO `'.$new_prefix.$v.'`';
        mysqli_query($conn,$sql);
    }
    print  数据表前缀：.$old_prefix."<br>".已经修改为：.$new_prefix."<br>";
}else{
    print 您的数据库表的前缀.$old_prefix.输入错误。请检查相关的数据库表的前缀;
    if (
        mysqli_free_result($result) ){
        return true;
    }
}
?>