File Operations in PHP

// Read file
$content = file_get_contents('file.txt');
$lines = file('file.txt', FILE_IGNORE_NEW_LINES);

// Write file
file_put_contents('file.txt', $data);
file_put_contents('log.txt', $data, FILE_APPEND);

// File info
if (file_exists($file)) {
    $size = filesize($file);
    $modified = filemtime($file);
}

// Directory operations
$files = scandir($directory);
mkdir('new_directory', 0755, true);