if (condition met) {
	statement(s);
	}
	
   elseif (condition met) {
	statement(s);
	}
	
   else {
	statement(s); 
	   }



	   
Example with matching variables to user-submitted values:

 if ($animal=='cats') {
	statement(s);
	}
	
   elseif ($animal=='dogs') {
	statement(s);
	}
	
   else {
	statement(s); 
	   }



	   
Example with isset()

if (isset($variable)) {
	statement(s);
	}
	
   else {
	statement(s); 
	   }