Online PHP editor | output for N3AR5

<?php define( 'ANIMAL', 'turtles!' ); $constant = constant(...); echo "I like {$constant('ANIMAL')}"; echo PHP_EOL; echo PHP_EOL; $fn = 'substr'; echo "I like {$fn('turtles!', 0, -1)}"; echo PHP_EOL; echo PHP_EOL; $escape = fn( $string ) => htmlspecialchars( (string) $string, ENT_QUOTES, 'utf-8' ); $userText = "<script>alert('xss')</script>"; echo "You entered {$escape( $userText )}"; echo PHP_EOL; echo PHP_EOL; class Arr { public static function get( $array, $key, $default = null ) { return is_array( $array ) && array_key_exists( $key, $array ) ? $array[$key] : $default; } } $fn = array( 'Arr', 'get' ); echo "I like {$fn(['turtles'], 0)}!";