What are the common pitfalls when moving PHP projects from Windows to Linux?

One common pitfall when moving PHP projects from Windows to Linux is the difference in file paths. Windows uses backslashes (\) while Linux uses forward slashes (/). To solve this issue, use the DIRECTORY_SEPARATOR constant in PHP which automatically selects the correct separator based on the operating system.

// Incorrect path definition on Windows
$filePath = 'C:\xampp\htdocs\project\file.php';

// Correct path definition using DIRECTORY_SEPARATOR
$filePath = 'C:' . DIRECTORY_SEPARATOR . 'xampp' . DIRECTORY_SEPARATOR . 'htdocs' . DIRECTORY_SEPARATOR . 'project' . DIRECTORY_SEPARATOR . 'file.php';