fix some invalid parameters types

Author: pjsde

system/Database/MySQLi/Builder.php

@@ -53,23 +53,4 @@ class Builder extends BaseBuilder
 	 */
 	protected $escapeChar = '`';
 
-	/**
-	 * FROM tables
-	 *
-	 * Groups tables in FROM clauses if needed, so there is no confusion
-	 * about operator precedence.
-	 *
-	 * Note: This is only used (and overridden) by MySQL.
-	 *
-	 * @return string
-	 */
-	protected function _fromTables(): string
-	{
-		if ( ! empty($this->QBJoin) && count($this->QBFrom) > 1)
-		{
-			return '('.implode(', ', $this->QBFrom).')';
-		}
-		
-		return implode(', ', $this->QBFrom);
-	}
 }

system/HTTP/Request.php

@@ -234,7 +234,7 @@ public function getIPAddress(): string
 	 */
 	public function isValidIP(string $ip = null, string $which = null): bool
 	{
-		switch (strtolower($which))
+		switch (strtolower( (string) $which))
 		{
 			case 'ipv4':
 				$which = FILTER_FLAG_IPV4;

system/HTTP/Response.php

@@ -714,7 +714,7 @@ public function sendHeaders()
 		// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html
 		if (! isset($this->headers['Date']))
 		{
-			$this->setDate(\DateTime::createFromFormat('U', time()));
+			$this->setDate(\DateTime::createFromFormat('U', (string) time()));
 		}
 
 		// HTTP Status