在PHP中使用AWK的`-F，'{print $ 1}'

I run unsuccessfully

$cookie = "masi@gmail.com,777";
$cookie_tripped = trim(",", $_COOKIE['login']);
echo "Cookie: "$cookie_tripped[0];     

It gives me

Cookie: 

How can you do the following command in PHP?

 awk -F, '{ print $1 }'

$cookie = "masi@gmail.com,777";
$cookie_tripped = explode(",", $cookie);
echo "Cookie: " . $cookie_tripped[0];