ing and why can use multiple single-line comments.  Try to</span>
<span class="c1">// keep the width reasonable, around 70 characters is the easiest to</span>
<span class="c1">// read.  Don&#39;t hesitate to link to permanent external resources</span>
<span class="c1">// that may provide greater detail:</span>
<span class="c1">//</span>
<span class="c1">// http://example.com/information_about_something/in_particular/</span>

<span class="nv">$parts</span> <span class="o">=</span> <span class="nv">$this</spa