The __LINE__ magic constant represents the current line number of the file in which it is used. It is useful for debugging or logging purposes, allowing you to track the line number where certain code is executed.
__LINE__: 22
The __FILE__ magic constant provides the full path and name of the file where it is used. This is helpful for including or requiring files, or for debugging purposes to know the exact file location.
__FILE__: /var/www/vhosts/wmoore.bitweb1.nwtc.edu/httpdocs/php/research-documentation/02-php-net.php
The __DIR__ magic constant returns the directory of the file where it is used. This is useful for including or requiring files from relative paths, especially when working with multiple directories.
__DIR__: /var/www/vhosts/wmoore.bitweb1.nwtc.edu/httpdocs/php/research-documentation
The __FUNCTION__ magic constant gives the name of the function where it is used. This can be used for debugging or logging to trace function calls.
__FUNCTION__: testFunction