add ValidImei rule

Author: milwad-dev

src/Rules/ValidImei.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Milwad\LaravelValidate\Rules;
+
+use Illuminate\Contracts\Validation\Rule;
+
+class ValidImei implements Rule
+{
+    /**
+     * Check jwt is valid.
+     *
+     * @param string $attribute
+     * @param mixed $value
+     * @return bool
+     */
+    public function passes($attribute, $value)
+    {
+        $imei = $value;
+
+        if (strlen($imei) != 15 || !ctype_digit($imei)) {
+            return false;
+        }
+
+        $digits = str_split($imei); // Get digits
+        $imei_last = array_pop($digits); // Remove last digit, and store it
+        $log = array();
+
+        foreach ($digits as $key => $n) {
+            if ($key & 1) {
+                $double = str_split($n * 2); // Get double digits
+                $n = array_sum($double); // Sum double digits
+            }
+
+            $log[] = $n; // Append log
+        }
+        $sum = array_sum($log) * 9; // Sum log & multiply by 9
+
+        return substr($sum, -1) === $imei_last;
+    }
+
+    /**
+     * Get the validation error message.
+     *
+     * @return string
+     */
+    public function message()
+    {
+        return __('imei');
+    }
+}