[SOLVED] String with only numbers?

[virtuexru]

How do I check if a string contains only numbers, would this be correct?

 

if (preg_match('/[^0-9"]/', $keyword)) {

    echo "numbers";

}

 

[virtuexru]

Nevermind, solved it:

 

if(!ctype_digit($keyword)) {

  }
else
{

}