参考

https://www.oracle.com/webfolder/technetwork/tutorials/obe/db/oow10/php_db/php_db.htm
https://www.php.net/manual/zh/ref.pdo-oci.php

PDO

$tns= "(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.2)(PORT = 1521)) (CONNECT_DATA =(SID = test)))";
$db_username = "NAME";
$db_password = "PWD";
try {
$conn = new PDO("oci:dbname=" . $tns, $db_username, $db_password);
} catch (PDOException $e) {
echo($e->getMessage());
}

常规

// Create connection to Oracle
$conn = oci_connect("SIZEMG", "sizemg_test", "//192.168.1.2/test");
if (!$conn) {
$m = oci_error();
echo $m['message'], "\n";
exit;
}
else {
print "Connected to Oracle!";
}
// Close the Oracle connection
oci_close($conn);
?>