What does this do?

[Peceiver]

      if(!isset($fromemail) || empty($fromemail) ||
        !isset($fname) || empty($fname) ||
        !isset($lname) || empty($lname) ||
        !isset($message)){
			echo 'empty data';
		}else{
			echo 'data verified';
		};

[dagon]

checks if $fromemail, $fname, $fname or $message is set or blank, if any of the 4 are (blank or unset) echo the text "empty data" else echo "data verified"

[Peceiver]

Thanks dragon.

[NogDog]

Note that the first 3 !isset() checks are redundant, since empty() includes such checking.

[Peceiver]

Nogdog, thanks for the invaluable information.
As a new php script kiddie trying to break into this language, thanks.