如何在PHP中回显定义值？

Question

我的代码在这里：

<?php define("SITENAME","Page TITLE");?>

我想回显定义值，如：

<?php echo "<?=SITENAME?>";?>

有人可以告诉我如何吗？

Answer 1

您可以如下回显常量的值

define("SITENAME","Page TITLE");
echo SITENAME.': My New Content Here';

这给出了： Page TITLE: My New Content Here

有关更多参考：

define("CONSTANT", "Hello world.");
echo CONSTANT; // outputs "Hello world."
echo Constant; // outputs "Constant" and issues a notice.

define("GREETING", "Hello you.", true);
echo GREETING; // outputs "Hello you."
echo Greeting; // outputs "Hello you."

// Works as of PHP 7
define('ANIMALS', array(
    'dog',
    'cat',
    'bird'
));
echo ANIMALS[1]; // outputs "cat"

Answer 2

干得好：

<?php 
    define("SITENAME","Page TITLE");    
    echo "My website title: ".SITENAME; 
?>

输出： My website title: Page TITLE