Warning: count(): Parameter must be an array or an object that implements Countable in D:\php\email\email1.php on line 8

Warning: count(): Parameter must be an array or an object that implements Countable in D:\php\email\email1.php on line 8

Fatal error: Uncaught Error: Call to undefined function mysql_real_escape_string() in D:\php\email\email1.php:25 Stack trace: #0 D:\php\email\test_emailu.php(25): sendEmail('antalek@seznam....', 'ladislav.mullne...', 'test emailu', 'Ahojky<br>nazd\xC3...') #1 {main} thrown in D:\php\email\email1.php on line 25