Adding line breaks to code

I'm having trouble producing code that can be easily read by humans in a browsers 'view source'

The code below looks like this in view source;

Line 0<br />Line 1<br />Line 2<br />Line 3<br />Line 4<br />

However I would like view source to look like this (without changing the rendered version of the page);
Line 0<br />
Line 1<br />
Line 2<br />
Line 3<br />
Line 4<br />

Can this be done?

for ($x = 0; $x < 5; $x++) {
  echo 'Line '.$x.'<br />';
}

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