Is there a way I can use PHP to check if my email content is spam?

The idea is that before I send mail, I would like to use some code to check the content to see if it is using a spam phrase. Here is a simple code

function isSpam($text)
{
    $pattern = "/\b(actual|filter|removed|because|it|contained|obscenities)\b/i";

    if(preg_match($pattern, $text, $match))
        return true;
    else
        return false;
}

      

        
        
        
      

    

Question:

• Is there a way to improve the code, like checking the runtime rather than just checking if it exists?

• Is there any other plugin or code out there so I don't need to repeat it?

• Bayesian Spam Filter - All About Inbox? Is this useful as an outbound email filter ?

thanks for the help