January 18th, 2013, 10:13 AM
Only if your code produces errors or warnings, which are then spit to the screen with plaintext headers.
If you do:
$a = array();
$b = $a['foo'];
You will get a warning about the undefined index 'foo'. If your server is set up to broadcast errors to the screen, that error will show up and the headers will be printed for a plaintext/HTML document.
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