PHP imports large amounts of data into mysql (example)

//Fast Mysql big data backup
//Before use, please first modify the SQL file name, database host name, database user name, and password to be imported according to the code comments ,Database name.
//At the same time, ftp the database file and text into the website directory, and then access this file in WEB mode
//edit: bbs.it-home.org
$file_name="bn_site.sql";//To be imported SQL file name
$dbhost="localhost";//Database host name
$dbuser="root";//Database user name
$dbpass="";//Database password
$dbname="bn_site"; // Database name
set_time_limit(0);//Set the timeout to 0, which means it will always be executed. When php is invalid in safe mode, the import will time out. At this time, it needs to be imported in sections
$fp=@fopen($file_name,"r") or die ("Cannot open SQL file");//Open the file
mysql_connect($dbhost,$dbuser,$dbpass) or die("Cannot connect to database"); //Connect to database
mysql_select_db($dbname) or die("Cannot open database"); //Open database
echo "is Execute import operation";
while($SQL=GETNEXTSQL()){
if(!mysql_query($sql)){
echo "Execution error: ".mysql_error()."";