ereg_replace for HTML tags

[Anon]

My dumb ISP (Actually very good, but behind the times) doesn't use the version of PHP that has either the strip_tags function or the preg functions. I need a ereg_replace function that will go through a string and pull out all HTML tags except for A, B, I, Blockquote, BR, and P. Any ideas?

[Anon]

Mike,
I'd say your best bet is to split or tokenize the string, then store each word as part of an array... then count through the array. have another array that has a set of 'acceptable' tags. Then, count through each item in your first array, and if it is bracketed (<>) then check it against the second array of acceptable tags. If the bracketed item is not acceptable, replace the value with $null. then reconstruct a string out of the first array. the code will be bulky and slow, I'm sure, though I haven't thought it through. hope this helps.
-S

[Anon]

In general, you need a smarter isp. As far as a fix, Stephen is
on the right track, as negative regex's get pretty hairy. That is
if you just wanted to allow <b>, you could probably say

$var = eregi_replace('(<[^{b][>]>)|(</[b][>]>)',} '', $var);

but once you start adding more alternatives it gets out of hand.

[Anon]

Yeah, I'm loathe to use ereg whenever preg is available - something else though, much more is going to be broken than that, since preg was introduced in php3 - this means whatever version they are running, probably php 2, is vastly outdated - you should call them and tell them to upgrade for securtity reasons alone... plus of course, then your question is no longer an issue 🙂

-S