$relativePath = "../images/logo.png"; $absolutePath = realpath($relativePath); echo $absolutePath; //Output: /home/user/public_html/images/logo.png
$absolutePath = "/home/user/public_html/images/logo.png"; $absolutePath2 = realpath($absolutePath); echo $absolutePath2; //Output: /home/user/public_html/images/logo.pngThe Filesystem library is a core PHP library, so no additional package or library is required.