How do I simply write out a file containing real tabs? tab represents the real tab, which is not a space. How to write tab or what characters are the real tab?

For example here:

$chunk = "a,b,c";
file_put_contents("chunk.csv",$chunk);

What characters should I use to get tabs instead of comma (,) there?

In the output file, there should be real tabs between delimited words.

• Real tab means, When we press the key in a text editor, we get a real wide space.