diff --git a/Source/Config/SplClassLoader.php b/Source/Config/SplClassLoader.php
index 793c19d..3667b53 100644
--- a/Source/Config/SplClassLoader.php
+++ b/Source/Config/SplClassLoader.php
@@ -38,21 +38,22 @@
  */
 class SplClassLoader
 {
-    private $_fileExtension = '.php';
-    private $_namespace;
-    private $_includePath;
-    private $_namespaceSeparator = '\\';
+    private $fileExtension = '.php';
+    private $namespace;
+    private $includePath;
+    private $namespaceSeparator = '\\';
 
     /**
      * Creates a new <tt>SplClassLoader</tt> that loads classes of the
      * specified namespace.
      *
-     * @param string $ns The namespace to use.
+     * @param string|null $ns The namespace to use.
+     * @param string|null $includePath
      */
     public function __construct(string $ns = null, string $includePath = null)
     {
-        $this->_namespace = $ns;
-        $this->_includePath = $includePath;
+        $this->namespace = $ns;
+        $this->includePath = $includePath;
     }
 
     /**
@@ -60,19 +61,19 @@ class SplClassLoader
      *
      * @param string $sep The separator to use.
      */
-    public function setNamespaceSeparator(string $sep)
+    public function setNamespaceSeparator(string $sep): void
     {
-        $this->_namespaceSeparator = $sep;
+        $this->namespaceSeparator = $sep;
     }
 
     /**
      * Gets the namespace seperator used by classes in the namespace of this class loader.
      *
-     * @return void
+     * @return string
      */
-    public function getNamespaceSeparator()
+    public function getNamespaceSeparator(): string
     {
-        return $this->_namespaceSeparator;
+        return $this->namespaceSeparator;
     }
 
     /**
@@ -80,9 +81,9 @@ class SplClassLoader
      *
      * @param string $includePath
      */
-    public function setIncludePath(string $includePath)
+    public function setIncludePath(string $includePath): void
     {
-        $this->_includePath = $includePath;
+        $this->includePath = $includePath;
     }
 
     /**
@@ -90,9 +91,9 @@ class SplClassLoader
      *
      * @return string $includePath
      */
-    public function getIncludePath()
+    public function getIncludePath(): string
     {
-        return $this->_includePath;
+        return $this->includePath;
     }
 
     /**
@@ -100,9 +101,9 @@ class SplClassLoader
      *
      * @param string $fileExtension
      */
-    public function setFileExtension($fileExtension)
+    public function setFileExtension(string $fileExtension): void
     {
-        $this->_fileExtension = $fileExtension;
+        $this->fileExtension = $fileExtension;
     }
 
     /**
@@ -110,15 +111,15 @@ class SplClassLoader
      *
      * @return string $fileExtension
      */
-    public function getFileExtension()
+    public function getFileExtension(): string
     {
-        return $this->_fileExtension;
+        return $this->fileExtension;
     }
 
     /**
      * Installs this class loader on the SPL autoload stack.
      */
-    public function register()
+    public function register(): void
     {
         spl_autoload_register(array($this, 'loadClass'));
     }
@@ -126,7 +127,7 @@ class SplClassLoader
     /**
      * Uninstalls this class loader from the SPL autoloader stack.
      */
-    public function unregister()
+    public function unregister(): void
     {
         spl_autoload_unregister(array($this, 'loadClass'));
     }
@@ -137,19 +138,19 @@ class SplClassLoader
      * @param string $className The name of the class to load.
      * @return void
      */
-    public function loadClass(string $className)
+    public function loadClass(string $className): void
     {
-        if (null === $this->_namespace || $this->_namespace.$this->_namespaceSeparator === substr($className, 0, strlen($this->_namespace.$this->_namespaceSeparator))) {
+        if (null === $this->namespace || str_starts_with($className, $this->namespace . $this->namespaceSeparator)) {
             $fileName = '';
             $namespace = '';
-            if (false !== ($lastNsPos = strripos($className, $this->_namespaceSeparator))) {
+            if (false !== ($lastNsPos = strripos($className, $this->namespaceSeparator))) {
                 $namespace = substr($className, 0, $lastNsPos);
                 $className = substr($className, $lastNsPos + 1);
-                $fileName = str_replace($this->_namespaceSeparator, DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
+                $fileName = str_replace($this->namespaceSeparator, DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
             }
-            $fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . $this->_fileExtension;
+            $fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . $this->fileExtension;
 
-            require_once ($this->_includePath !== null ? $this->_includePath . DIRECTORY_SEPARATOR : '') . $fileName;
+            require_once ($this->includePath !== null ? $this->includePath . DIRECTORY_SEPARATOR : '') . $fileName;
         }
     }
-}
\ No newline at end of file
+}