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php基础-define跟defined函数的使用

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Release： 2016-06-13 10:49:37
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php基础-define和defined函数的使用

??? define("TEST_ATTR","hhhhhhh");
??? echo TEST_ATTR;

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define相当于java中的constant用来定义一个常量；

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defined() 函数检查某常量是否存在。

若常量存在，则返回 true，否则返回 false。

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define("GREETING","Hello world!");echo <code>defined("GREETING")</code>;
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