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php的恒量

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Release： 2016-06-13 11:43:07
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php的常量

常量是php脚本中定义的不会改变的值。函数define()用于定义常量。常量一旦被定义，就不能改变，只能通过常量名访问常量，在常量名前没有符号$

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<?phpdefine ("PI",3.1415926);print PI;?>
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