How to delete a file via PHP?

$files = [
    './first.jpg',
    './second.jpg',
    './third.jpg'
];

foreach ($files as $file) {
    if (file_exists($file)) {
        unlink($file);
    } else {
        // File not found.
    }
}

The following should help

• realpath — Returns canonicalized absolute pathname
• is_writable — Tells whether the filename is writable
• unlink — Deletes a file

Run your filepath through realpath, then check if the returned path is writable and if so, unlink it.