Description:
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when encountering code below, php 
1) ignores the comment
2) apparently leave php-mode

note: error 2) makes the rest of the php-script code show up in browser (as result of leaving php)

Reproduce code:
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// $Idxhtm = str_replace('<?php print $I_fmGetpage; ?>', '#pgnum', $Idxhtm));

notes: 
allthouh it is commented out, the code intended to replace a php-tag in a string containing a html form. The php-tag is single quoted and should be replaced with #pgnum - no fuzz.

removing commented line solves problem.

Expected result:
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nuthin - it should be regarded as a comment by php

Actual result:
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sleepless hours - dry throat - nervous breakdown and backpain