PHP script doesn't work with // comments

Question

I have a PHP script that doesn't seem to work when it contains a // type comment. I mean, the script just doesn't seem to execute beyond the // style comment. E.g.

<?php header('Content-type: text/plain');

// some comment
echo "OK";

doesn't work, no output. but:

<?php header('Content-type: text/plain');

echo "OK";

does work. I see OK as output. And:

<?php header('Content-type: text/plain');

/* some comment */    
echo "OK";

Also works. Again I see OK as output.

I never encountered this before. Could there be any PHP settings that control this behavior? How do I make my // style comments work?

@Gumbo: This IS the actual code. I didn't copy and paste because typing it in was just as fast (although I forgot to type the ;). — Luke
– Luke, Commented Aug 8, 2009 at 7:43
Your first example (the buggy one) works on Win XP with PHP 5.3.0 under Apache and LightTPD, the fault might be your editor I guess. — Alix Axel
– Alix Axel, Commented Aug 8, 2009 at 8:03

Thorarin · Accepted Answer · 2009-08-08 08:03:53Z

4

What kind of platform are you on and which editor are you using? Because the only thing I can think of is that the interpreter doesn't like your newlines. Are you using Apple style (\r only) newlines?

I'm not able to reproduce your problem on PHP 5.2.9-4 running on Linux, not with Mac encoding either.

Just to be sure, have you tried adding a closing tag after the echo statement? (?>). Otherwise, add that now and see if it makes a difference.

edited Aug 8, 2009 at 8:03

answered Aug 8, 2009 at 7:49

Thorarin

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3 Comments

paxdiablo Over a year ago

Possibly, UNIX newlines on a Windows system may also cause a problem (if the Windows interpreter needs to see \r\n and it only get \n).

Gumbo Over a year ago

The closing tag is optional (see docs.php.net/manual/en/…).

Thorarin Over a year ago

@Gumbo: Oh, didn't use to be though, as far as I know... goes to show how long it's been since I've done serious PHP work.

Eli C · Accepted Answer · 2023-10-05 06:59:00Z

0

I had a similar issue and adding a closing tag (?>) fixed it for me.

<header>
<?php // require_once $_SERVER['DOCUMENT_ROOT'] . '/common/header.php'; ?>
</header>

answered Oct 5, 2023 at 6:59

Eli C

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