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PHP5.3中新增的魔术常量__DIR__获取当前文件的目录绝对路径

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Release： 2016-06-20 13:05:17
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我们知道PHP中提供了一个魔术常量(magic constant)__FILE__，用来指向当前执行的PHP脚本。

但PHP没有直接提供该脚本所在目录的常量。也就是说如果我们要得到当前PHP脚本所在的目录，需要使用dirname()这个函数：

<?php

$dir = dirname(__FILE__);

?>
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在PHP5.3中，增加了一个新的常量__DIR__，指向当前执行的PHP脚本所在的目录。

例如当前执行的PHP文件为 /www/website/index.php

则__FILE__等于'/www/website/index.php'

而__DIR__等于'/www/website'

现在我们要包含当前文件目录或子目录下的文件，可以直接使用：

<?php

require_once __DIR__ . &#39;/path/to/test.inc.php&#39;;
?>
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Related labels：
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