How to get current directory, filename and code line number in PHP
PHP provides large number of magical constants. These all constants are case sensitive. With the help of these constants, we can get current directory, filename, current line number and much more. It is more secure, reliable and fast that has resulted in web developers preferring to work with PHP. So, there is no matter if the developer need to know the line number or current directory of PHP document.
These are the some examples of PHP Magic Constants.
To get the current directory
__DIR__ : This constant is used to get the current directory of the file. This is equivalent to the dirname(__FILE__). This directory name does not have a trailing slash unless it is the root directory. If used inside an include method, the directory of the included file is returned.
<?php echo "The current directory of this file is '" . __DIR__ . "'.\n"; ?>
Output: The current directory of this file is 'C:\wamp\www\demo'.
To get the current filename with full file path
__FILE__ : This is used to return the full file path and filename of the file. If used inside an include method , the name of the included file is returned.
<?php echo "The current file with path is '" . __FILE__ . "'.\n"; ?>
Output: The current file with path is 'C:\wamp\www\demo\magic_const.php'.
This magic constant is mostly used in case where we have to include some files from the directory.
To get the current line number
__LINE__ : This is used to return the current line number of the file.
<?php echo "The line number of this code is '" . __LINE__ . "'.\n"; ?>
Output: The line number of this code is '34'.
This constant is mostly used while debugging the code, or to get line number of the error.
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