Strange error with using slash

Question

I am using the PHP library for Sendgrid (https://github.com/sendgrid/sendgrid-php). Following the instructions, I had to use this line of code:

$mail = new SendGrid\Mail();

I get the error:

Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /home/d/public_html/ac/application/controllers/email.php on line 20

Parse error: syntax error, unexpected T_STRING in /home/d/public_html/ac/application/controllers/email.php on line 20

Is there something wrong with using '\'? Seems strange to me... How can I get this to work?

Answer 1

That \ is part of namespaces, a new feature in PHP 5.3.