


php excel reader reads excel content and stores it in the database implementation code_PHP tutorial
The previous article introduced the method of php-excel-reader to read excel files. Because of need, excel data like this:
The new database table is as follows:
-- Database: `alumni`
-- Table structure `alumni`
CREATE TABLE IF NOT EXISTS `alumni` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`gid` varchar(20) DEFAULT NULL COMMENT 'File number',
`student_no` varchar(20) DEFAULT NULL COMMENT 'student number',
`name` varchar(32) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `gid` (`gid`),
KEY `name` (`name`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
The database results after importing are as follows:
php source code is as follows:
header ("Content-Type:text/html;charset=utf-8");
require_once 'excel_reader2.php';
set_time_limit(20000);
ini_set("memory_limit","2000M");
//Use pdo to connect to the database
$dsn = "mysql:host=localhost;dbname=alumni;";
$user = "root";
$password = "";
try{
$dbh = new PDO($dsn,$user,$password);
$dbh->query('set names utf8;');
}catch(PDOException $e){
echo "Connection failed".$e->getMessage();
}
//pdo binding parameter operation
$stmt = $dbh->prepare("insert into alumni( gid,student_no,name) values (:gid,:student_no,:name) ");
$stmt->bindParam(":gid", $gid,PDO::PARAM_STR);
$stmt- >bindParam(":student_no", $student_no,PDO::PARAM_STR);
$stmt->bindParam(":name", $name,PDO::PARAM_STR);
//Use php- excel-reader reads excel content
$data = new Spreadsheet_Excel_Reader();
$data->setOutputEncoding('UTF-8');
$data->read("stu.xls" );
for ($i = 1; $i sheets[0]['numRows']; $i++) {
for ($j = 1; $j $student_no = $data->sheets[0]['cells'][$i][1];
$name = $data->sheets[0] ['cells'][$i][2];
$gid = $data->sheets[0]['cells'][$i][3];
}
// Insert the obtained excel content into the database
$stmt->execute();
}
echo "Execution successful";
echo "Last inserted ID: ".$dbh-> lastInsertId();
?>
Considering that the amount of excel is relatively large, the binding operation of PDO is used!

PHPsessionscanstorestrings,numbers,arrays,andobjects.1.Strings:textdatalikeusernames.2.Numbers:integersorfloatsforcounters.3.Arrays:listslikeshoppingcarts.4.Objects:complexstructuresthatareserialized.

TostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei

Session regeneration refers to generating a new session ID and invalidating the old ID when the user performs sensitive operations in case of session fixed attacks. The implementation steps include: 1. Detect sensitive operations, 2. Generate new session ID, 3. Destroy old session ID, 4. Update user-side session information.

PHP sessions have a significant impact on application performance. Optimization methods include: 1. Use a database to store session data to improve response speed; 2. Reduce the use of session data and only store necessary information; 3. Use a non-blocking session processor to improve concurrency capabilities; 4. Adjust the session expiration time to balance user experience and server burden; 5. Use persistent sessions to reduce the number of data read and write times.

PHPsessionsareserver-side,whilecookiesareclient-side.1)Sessionsstoredataontheserver,aremoresecure,andhandlelargerdata.2)Cookiesstoredataontheclient,arelesssecure,andlimitedinsize.Usesessionsforsensitivedataandcookiesfornon-sensitive,client-sidedata.

PHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.

The security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.

PHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita


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