//echo echo "Hello World!
"; Echo "Hello World!
"; ECHO "Hello World!
"; // Constants define('FRUIT', 'Apple'); echo FRUIT .'
'; echo Fruit .'
'; echo fruit .'
'; // Variables $COLOR = 'Blue'; $Color = 'Red'; $color = 'Green'; echo $COLOR .'='. $Color .'='. $color .'
'; // built-in functions $a = 'sample'; echo strlen($a) .'
'; echo STRLEN($a) .'
';