What is the correct syntax for constructing a path variable in PHP to avoid errors?

When constructing a path variable in PHP, it's important to use the correct directory separator to avoid errors. The recommended way to construct a path variable is by using the `DIRECTORY_SEPARATOR` constant, which automatically inserts the correct directory separator based on the operating system. This ensures that your path variable is formatted correctly and works on different platforms.

// Constructing a path variable using DIRECTORY_SEPARATOR
$myPath = 'path' . DIRECTORY_SEPARATOR . 'to' . DIRECTORY_SEPARATOR . 'file.php';