Update IranianMobile.php

increase performance

Author: NVD-R

src/Rules/IranianMobile.php

@@ -89,7 +89,7 @@ public function validate(string $attribute, mixed $value, Closure $fail): void
             'all'       => 'ir_mobile_with_country_code',
         ];
 
-        if (! array_key_exists($this->format, $formatPatterns)) {
+        if (!isset($formatPatterns[$this->format]))
             throw new \InvalidArgumentException('Invalid format. valid formats are: ' .
                 implode(', ', array_keys($formatPatterns))
             );