New magic constants in PHP 5.3__DIR___PHP Tutorial

We know that PHP provides a magic constant (magic constant) __FILE__, which is used to point to the currently executing PHP script. But PHP does not directly provide constants for the directory where the script is located. That is to say, if we want to get the directory where the current PHP script is located, we need to use the dirname() function:

$dir =dirname(__FILE__);

?>

In PHP5.3, a new constant __DIR__ is added, pointing to the directory where the currently executed PHP script is located.

For example, the currently executed PHP file is /www/website/index.php

Then __FILE__ is equal to /www/website/index.php

And __DIR__ is equal to /www/website

Now we want to include files in the current file directory or subdirectory, we can use it directly:

require_once __DIR__ ./path/to/test.inc.php;
?>

http://www.bkjia.com/PHPjc/486617.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/486617.htmlTechArticleWe know that PHP provides a magic constant (magic constant) __FILE__, which is used to point to the currently executing PHP script. But PHP does not directly provide constants for the directory where the script is located. That is to say...