Unexpected T_BOOLEAN_OR in email script

I wrote a script to send the contents of a contact form (first name, last name and email address) to the website owner. However, when I press the Submit button on my form the error:

Unexpected T_BOOLEAN_OR 

is given. Here's the snippet of code near the line number referenced:

function died($error) {  

echo "We are very sorry, but there were error(s) found with the form you submitted. ";   
echo "These errors appear below.<br /><br />";         
echo $error."<br /><br />";         
echo "Please go back and fix these errors.<br /><br />";        
die();     }           
// validation expected data exists    
if(!isset($_POST['first_name']) ||         
!isset($_POST开发者_开发问答['last_name']) ||        
!isset($_POST['email'])) || {    
died('We are sorry, but there appears to be a problem with the form you submitted.'); 
}           

Thanks much for your help:)

!isset($_POST['email'])) || {     <-- there's your problem