In what situations should PHP developers use vardump to debug their code, particularly when dealing with file operations?

PHP developers should use vardump to debug their code when they need to inspect the contents of variables, arrays, or objects during file operations. This can help them identify any issues with file reading, writing, or manipulation. By using vardump, developers can easily view the data being processed and pinpoint any errors in their code.

$file = 'example.txt';

// Reading file contents
$content = file_get_contents($file);
vardump($content);

// Writing to a file
$data = "Hello, World!";
file_put_contents($file, $data);
vardump($data);

// Checking file existence
if (file_exists($file)) {
    echo "File exists!";
} else {
    echo "File does not exist!";
}