Added: Signin Up, connection to the DB, validator, base controller, base view, environment file, User model

core/Validator.php

@@ -0,0 +1,55 @@
+<?php
+
+class Validator {
+    private $errors = [];
+
+    /**
+     * Check if a field is not empty
+     */
+    public function required($field, $value, $message = null) {
+        if (empty(trim($value))) {
+            $this->errors[$field] = $message ?? "$field is required.";
+        }
+    }
+
+    /**
+     * Check if a field meets minimum length
+     */
+    public function minLength($field, $value, $length, $message = null) {
+        if (strlen($value) < $length) {
+            $this->errors[$field] = $message ?? "$field must be at least $length characters.";
+        }
+    }
+
+    /**
+     * Check if a field contains letters and numbers
+     */
+    public function alphanumeric($field, $value, $message = null) {
+        if (!preg_match('/^(?=.*[a-zA-Z])(?=.*\d).+$/', $value)) {
+            $this->errors[$field] = $message ?? "$field must contain letters and numbers.";
+        }
+    }
+
+    /**
+     * Validate an email
+     */
+    public function email($field, $value, $message = null) {
+        if (!filter_var($value, FILTER_VALIDATE_EMAIL)) {
+            $this->errors[$field] = $message ?? "Invalid email format.";
+        }
+    }
+
+    /**
+     * Get validation errors
+     */
+    public function errors() {
+        return $this->errors;
+    }
+
+    /**
+     * Check if validation passed
+     */
+    public function passes() {
+        return empty($this->errors);
+    }
+}