how to connect to a database in php

//Connect MSSQL
$serverName = '192.xxx.xxx.xx';
$userName = 'usertest';
$userPassword = 'pwdtest';
$dbName = 'dbtest';
 
try{
	$conn = new PDO("sqlsrv:server=$serverName ; Database = $dbName", $userName, $userPassword);
	$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(Exception $e){
	die(print_r($e->getMessage()));
}
 
//การ query และแสดงข้อมูล จัดเรียงตามฟิวด์ field1 แบบมากไปน้อย เริ่มที่เรคคอร์ดที่ 0-100
$query = " SELECT * FROM tbl 
ORDER BY field1 DESC
OFFSET 0 ROWS
FETCH NEXT 100 ROWS ONLY ";
$getRes = $conn->prepare($query);
$getRes->execute();
 
while($row = $getRes->fetch( PDO::FETCH_ASSOC ))
{
echo $row['field1']."<br />";
echo $row['field2']."<br />";
}

This is an update to a note I wrote earlier concerning how to set multiple attributes when you create you PDO connection string.

You can put all the attributes you want in an associative array and pass that array as the fourth parameter in your connection string. So it goes like this:
<?php
$options = [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_CASE => PDO::CASE_NATURAL,
    PDO::ATTR_ORACLE_NULLS => PDO::NULL_EMPTY_STRING
];

// Now you create your connection string
try {
    // Then pass the options as the last parameter in the connection string
    $connection = new PDO("mysql:host=$host; dbname=$dbname", $user, $password, $options);

    // That's how you can set multiple attributes
} catch(PDOException $e) {
    die("Database connection failed: " . $e->getMessage());
}
?>