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bool defained(string constants_name)
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  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
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