<?php
$a = 0;

if (!empty($a)) {
 echo "not empty";
} else {
 echo "empty"
}

?>

Line 1: error: expected identifier or '(' before '<' token
Line 4: error: expected identifier or '(' before 'if'
Line 6: error: expected identifier or '(' before 'else'
Line 10: error: expected identifier or '(' before '?' token