--- /dev/null
+<?php
+
+namespace Wikimedia\Assert;
+
+use InvalidArgumentException;
+
+/**
+ * Exception indicating that an parameter assertion failed.
+ * This generally means a disagreement between the caller and the implementation of a function.
+ *
+ * @license MIT
+ * @author Daniel Kinzler
+ * @copyright Wikimedia Deutschland e.V.
+ */
+class ParameterAssertionException extends InvalidArgumentException implements AssertionException {
+
+ /**
+ * @var string
+ */
+ private $parameterName;
+
+ /**
+ * @param string $parameterName
+ * @param string $description
+ *
+ * @throws ParameterTypeException
+ */
+ public function __construct( $parameterName, $description ) {
+ if ( !is_string( $parameterName ) ) {
+ throw new ParameterTypeException( 'parameterName', 'string' );
+ }
+
+ if ( !is_string( $description ) ) {
+ throw new ParameterTypeException( 'description', 'string' );
+ }
+
+ parent::__construct( "Bad value for parameter $parameterName: $description" );
+
+ $this->parameterName = $parameterName;
+ }
+
+ /**
+ * @return string
+ */
+ public function getParameterName() {
+ return $this->parameterName;
+ }
+
+}