Replacing PHP code

[Anon]

Hi there,

I am trying to replace some PHP code in a string with something else. What I need to do is to replace every instance of <?php echo($ForumName); ?> with [[ForumName]], and then in another script do the same thing in reverse (Replace [[ForumName]] with the php code). I have tried using:
$header = eregi_replace('<?php echo($ForumName); ?>', "[[ForumName]]", $header);
And
$string = "<" . "?php " . "ech"."o("."\$"."."ForumName)".; . " ?" . ">";
$header = eregi_replace($string, "[[ForumName]]", $header);

But none of them work. How can I do this? There is HTML code in the file that I can't damage, as the string is written back to a file at the end, to be used on the website.

If you want to know why I'm doing this, it's to prevent newbies from messing up the PHP code...

TIA,
Peter.

[Anon]

Hi - This snippet works OK for me in PHP4, using str_replace instead of eregi, but you may have good reasons for going with eregi.

$header= "<?php echo(\$ForumName); ?> remainder of line";

$header = str_replace("<?php echo(\$ForumName); ?>","[[ForumName]]",$header);
echo htmlentities($header),"<br>";
$header = str_replace("[[ForumName]]","<?php echo(\$ForumName); ?>",$header);
echo htmlentities($header),"<br>";

I'm only using the 'htmlentities' function to get the variable to show up rather than the browser ignoring it in the php tags.

[Anon]

Thanks for that. Worked when my eregi_replace code didn't. Will have to play and see if I can make it work...

Thanks again,
Peter.