<?php echo (empty($LOGO) ? $TITLE : $LOGO) ?>
will show $TITLE if $LOGO is empty. Otherwise will only show $LOGO.
This operator is called the ternary operator.
empty works like this:
The following things are considered to be empty:
- "" (an empty string)
- 0 (0 as an integer)
- 0.0 (0 as a float)
- "0" (0 as a string)
- NULL
- FALSE
- array() (an empty array)
- $var; (a variable declared, but without a value)
