<!DOCTYPE html> <html> <body> <?php // 定义对大小写敏感的常量 define("GREETING", "Welcome to cnn84.com/school/w3c!"); echo GREETING; echo "<br>"; // 不会输出常量的值 echo greeting; ?> </body> </html>
<?php // 定义对大小写敏感的常量 define("GREETING", "Welcome to cnn84.com/school/w3c!"); echo GREETING; echo "<br>"; // 不会输出常量的值 echo greeting; ?>