Use PDO subdriver constants and functions

Author: jamieburchell

composer.json

@@ -11,7 +11,7 @@
 		"source": "https://github.com/bcit-ci/CodeIgniter"
 	},
 	"require": {
-		"php": ">=7.4"
+		"php": ">=8.4"
 	},
 	"scripts": {
 		"test:coverage": [

system/database/drivers/pdo/pdo_driver.php

@@ -142,7 +142,7 @@ public function db_connect($persistent = FALSE)
 
 		try
 		{
-			return new PDO($this->dsn, $this->username, $this->password, $this->options);
+			return PDO::connect($this->dsn, $this->username, $this->password, $this->options);
 		}
 		catch (PDOException $e)
 		{

system/database/drivers/pdo/subdrivers/pdo_mysql_driver.php

@@ -143,34 +143,34 @@ public function db_connect($persistent = FALSE)
 
 			if ( ! empty($sql))
 			{
-				if (empty($this->options[PDO::MYSQL_ATTR_INIT_COMMAND]))
+				if (empty($this->options[Pdo\Mysql::ATTR_INIT_COMMAND]))
 				{
-					$this->options[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET SESSION sql_mode = '.$sql;
+					$this->options[Pdo\Mysql::ATTR_INIT_COMMAND] = 'SET SESSION sql_mode = '.$sql;
 				}
 				else
 				{
-					$this->options[PDO::MYSQL_ATTR_INIT_COMMAND] .= ', @@session.sql_mode = '.$sql;
+					$this->options[Pdo\Mysql::ATTR_INIT_COMMAND] .= ', @@session.sql_mode = '.$sql;
 				}
 			}
 		}
 
 		if ($this->compress === TRUE)
 		{
-			$this->options[PDO::MYSQL_ATTR_COMPRESS] = TRUE;
+			$this->options[Pdo\Mysql::ATTR_COMPRESS] = TRUE;
 		}
 
 		if (is_array($this->encrypt))
 		{
 			$ssl = array();
-			empty($this->encrypt['ssl_key'])    OR $ssl[PDO::MYSQL_ATTR_SSL_KEY]    = $this->encrypt['ssl_key'];
-			empty($this->encrypt['ssl_cert'])   OR $ssl[PDO::MYSQL_ATTR_SSL_CERT]   = $this->encrypt['ssl_cert'];
-			empty($this->encrypt['ssl_ca'])     OR $ssl[PDO::MYSQL_ATTR_SSL_CA]     = $this->encrypt['ssl_ca'];
-			empty($this->encrypt['ssl_capath']) OR $ssl[PDO::MYSQL_ATTR_SSL_CAPATH] = $this->encrypt['ssl_capath'];
-			empty($this->encrypt['ssl_cipher']) OR $ssl[PDO::MYSQL_ATTR_SSL_CIPHER] = $this->encrypt['ssl_cipher'];
+			empty($this->encrypt['ssl_key'])    OR $ssl[Pdo\Mysql::ATTR_SSL_KEY]    = $this->encrypt['ssl_key'];
+			empty($this->encrypt['ssl_cert'])   OR $ssl[Pdo\Mysql::ATTR_SSL_CERT]   = $this->encrypt['ssl_cert'];
+			empty($this->encrypt['ssl_ca'])     OR $ssl[Pdo\Mysql::ATTR_SSL_CA]     = $this->encrypt['ssl_ca'];
+			empty($this->encrypt['ssl_capath']) OR $ssl[Pdo\Mysql::ATTR_SSL_CAPATH] = $this->encrypt['ssl_capath'];
+			empty($this->encrypt['ssl_cipher']) OR $ssl[Pdo\Mysql::ATTR_SSL_CIPHER] = $this->encrypt['ssl_cipher'];
 
-			if (defined('PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT') && isset($this->encrypt['ssl_verify']))
+			if (defined('Pdo\Mysql::ATTR_SSL_VERIFY_SERVER_CERT') && isset($this->encrypt['ssl_verify']))
 			{
-				$ssl[PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT] = $this->encrypt['ssl_verify'];
+				$ssl[Pdo\Mysql::ATTR_SSL_VERIFY_SERVER_CERT] = $this->encrypt['ssl_verify'];
 			}
 
 			// DO NOT use array_merge() here!