PHP创建写入sql数据库文件到库中

/导入数据表
        $sqldata=file_get_contents(APP_PATH . 'install/data/mysql.sql');
        $sqlFormat = $this->sql_split($sqldata, $dbpre);//$dbpre为数据表前缀如：yy_ 、tp_等
        //创建写入sql数据库文件到库中 结束

/**
         * 执行SQL语句
         */
        $counts = count($sqlFormat);
        $n = intval($n);
        for ($i = 0; $i < $counts; $i++) {
            $sql = trim($sqlFormat[$i]);
            if (strstr($sql, 'CREATE TABLE')) {
                preg_match('/CREATE TABLE `([^ ]*)`/', $sql, $matches);
                mysqli_query($conn,"DROP TABLE IF EXISTS `$matches[1]");
                $ret = mysqli_query($conn,$sql);
                if ($ret) {
                    $message = '<li><span class="correct_span">√</span>创建数据表' . $matches[1] . '，完成!<span style="float: right;">'.date('Y-m-d H:i:s').'</span></li> ';
                } else {
                    $message = '<li><span class="correct_span error_span">√</span>创建数据表' . $matches[1] . '，失败!<span style="float: right;">'.date('Y-m-d H:i:s').'</span></li>';
                }
            } else {
                if(trim($sql) == '')
                    continue;
                $ret = mysqli_query($conn,$sql);
              
            }
        }

function sql_split($sql, $tablepre) {
    if ($tablepre != "yy_")
        $sql = str_replace("yy_", $tablepre, $sql);

    $sql = preg_replace("/TYPE=(InnoDB|MyISAM|MEMORY)( DEFAULT CHARSET=[^; ]+)?/", "ENGINE=\\1 DEFAULT CHARSET=utf8", $sql);

    $sql = str_replace("\r", "\n", $sql);
    $ret = array();
    $num = 0;
    $queriesarray = explode(";\n", trim($sql));
    unset($sql);
    foreach ($queriesarray as $query) {
        $ret[$num] = '';
        $queries = explode("\n", trim($query));
        $queries = array_filter($queries);
        foreach ($queries as $query) {
            $str1 = substr($query, 0, 1);
            if ($str1 != '#' && $str1 != '-')
                $ret[$num] .= $query;
        }
        $num++;
    }
    return $ret;
}

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