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Constants differ from normal variables in that you don‘t use the $ symbol to declare or use them.
<?php class MyClass { const constant = ‘constant value‘; function showConstant() { echo self::constant . "\n"; } } echo MyClass::constant . "\n"; $classname = "MyClass"; echo $classname::constant . "\n"; // 自 5.3.0 起 $class = new MyClass(); $class->showConstant(); echo $class::constant."\n"; // 自 PHP 5.3.0 起 ?>
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原文地址：http://www.cnblogs.com/iMirror/p/4476140.html
