first commit

lib/pkp/classes/validation/Validator.php

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+<?php
+
+/**
+ * @defgroup validation Validation
+ * Implements validation operations.
+ */
+
+/**
+ * @file classes/validation/Validator.php
+ *
+ * Copyright (c) 2014-2021 Simon Fraser University
+ * Copyright (c) 2000-2021 John Willinsky
+ * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
+ *
+ * @class Validator
+ *
+ * @ingroup validation
+ *
+ * @brief Abstract class that represents a validation check. This class and its
+ *  sub-classes can be used outside a form validation context which enables
+ *  re-use of complex validation code.
+ */
+
+namespace PKP\validation;
+
+abstract class Validator
+{
+    /**
+     * Check whether the given value is valid.
+     *
+     * @param mixed $value the value to be checked
+     *
+     * @return bool
+     */
+    abstract public function isValid($value);
+}
+
+if (!PKP_STRICT_MODE) {
+    class_alias('\PKP\validation\Validator', '\Validator');
+}