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bool defained(string constants_name)
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define ("MESSAGE", "PHP³£Á¿¶¨Òå,³£Á¿ÃûÇø±ð´óСд");
echo MESSAGE."<br/>"; //Êä³ö³£Á¿MESSAGE
echo Message."<br/>"; //Êä³ö"Message"£¬±íʾûÓиó£Á¿
define("MESSAGE2", "PHP³£Á¿¶¨Òå,³£Á¿Ãû²»Çø±ð´óСд", true);
echo MESSAGE2."<br/>"; //Êä³ö³£Á¿MESSAGE2
echo Message2."<br/>"; //Êä³ö³£Á¿
$constant_name = "message2";
echo constant($constant_name)."<br/>"; //Êä³ö³£Á¿MESSAGE2
echo defined("MESSAGE")."<br/>"; //Èç¹û¶¨Òå·µ»Øtrue,echoÊä³öÏÔʾ1
?>
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