if else php means code example

Example 1: php else

<?php
if ($a > $b) {
  echo "a is greater than b";
} else {
  echo "a is NOT greater than b";
}
?>

Example 2: PHP if...else...elseif Statements

<?php
$t = date("H");

if ($t < "20") {
  echo "Have a good day!";
}
?>