PHP - BBcode

Shwaza · 16-04-2005, 12:56

Hell everybody

Today i'm going to teach you how you can use the PHP function "str_replace()" to add bbcode to your site

. You have probably noticed on several forums, or chat rooms, or other things that you can post in, that you can type in something like [B ]Text[/B ] and it will turn that text into bold, (Minus the space ofcourse though).

First of all, i'll show you a small little example, of how to make bold text, when a user types in [B ] and [/B ].

PHP Code:

  <?php

 
//Set an origional value for $message

$message="Hello, this text is [b]Bold[/b]";

 
//Set values for [b] and [/b] to be changed to

$message=str_replace('[b]', '<b>', $message);

$message=str_replace('[/b]', '</b>', $message);

 
//Echo out the new value

echo $message;

 
?>

And that will echo out:

Hello, this text is Bold

However, that's just a very uncomplicated use for it. Say you wanted to have something like [QUOTE ], and [/QUOTE ]. You would use something like this.

PHP Code:

  <?php

 
//Set origional value for $message

$message="[quote]Quoted text[/quote]";

 
//Set the new values for [quote] and [/quote]

$message=str_replace('[quote]', '<table width="400" border="1">

<tr><td>Quote</td></tr><tr><td>', $message);

$message=str_replace('[/quote]', '</td></tr></table>', $message);

 
//Echo out the new $message

echo $message;

 
?>

Now, you probably might have noticed at one point or another, that if you submit something, and you're using a text area, that when you press the enter key, it won't make a <br />. Say you had a small shoutbox or something, and you wanted to allow people to make line breaks, you could use str_replace to do that.

PHP Code:

  <?php

 
//Set a value for $message

$message="Line one

 
Line 2";

 
//Set value for line breaks

$message=str_replace(chr(13), '<br />', $message);

 
//Echo out the new $message

echo $message;

 
?>

And you'll see that now, we aren't converting html, we're converting chr(13). That is because the enter key is equal to chr(13), so everytime it finds a line break, it will convert it to a <br />.

Finally, i'll show you how to disallow HTML, in a submitted post. Say you didn't want to allow people to post html, because it could mess up your layout or something. You could just do this:

PHP Code:

  <?php

 
//Set a value for $message

$message="<b>Bold Text</b>";

 
//Disallow html

$message=str_replace('<', '&lt;', $message);

$message=str_replace('>', '&gt;', $message);

 
//Echo the new $message

echo $message;

 
?>

Those will convert < and > into < and > except on the users side, not as html.

I hope this was helpful for you

And if you have any questions, don't hesitate to ask!

Tim · 16-04-2005, 14:38

Actually, I'll be mean and critisize your ideas.
First off, what if someone decided to just put a , and not finish it with a ? Then the whole rest of your page would be bold, completely recking it. This is why most BBCode systems use pattern replacing instead of straight out string replacing.
Second, your html break codes could be simplified by using the nl2br() function.
Third, you should A: put your html remover before all of your bbcode is replaced, and B: The removing of the tags -- and a bunch of other stuff -- can be simplified with the htmlentities() function.

That's all, folks.

Shwaza · 17-04-2005, 00:48

And there goes tim ruining my tuts as always :P

Tim · 17-04-2005, 00:49

You betcha

mck9235 · 17-04-2005, 02:10

I'm never posting tutorials again, Tim is just too scary.

I thought it was cool Shwaza.

Departed · 17-04-2005, 02:27

Yeah, nice one shwaza.

Keep it up.

16-04-2005, 12:56	#1 (permalink)
Shwaza WMT Addict Join Date: Apr 2005 Posts: 120 iTrader: 0 / 0%	PHP - BBcode Hell everybody Today i'm going to teach you how you can use the PHP function "str_replace()" to add bbcode to your site . You have probably noticed on several forums, or chat rooms, or other things that you can post in, that you can type in something like [B ]Text[/B ] and it will turn that text into bold, (Minus the space ofcourse though). First of all, i'll show you a small little example, of how to make bold text, when a user types in [B ] and [/B ]. PHP Code: `<?php //Set an origional value for $message $message="Hello, this text is [b]Bold[/b]"; //Set values for [b] and [/b] to be changed to $message=str_replace('[b]', '<b>', $message); $message=str_replace('[/b]', '</b>', $message); //Echo out the new value echo $message; ?>` And that will echo out: Hello, this text is Bold However, that's just a very uncomplicated use for it. Say you wanted to have something like [QUOTE ], and [/QUOTE ]. You would use something like this. PHP Code: `<?php //Set origional value for $message $message="[quote]Quoted text[/quote]"; //Set the new values for [quote] and [/quote] $message=str_replace('[quote]', '<table width="400" border="1"> <tr><td>Quote</td></tr><tr><td>', $message); $message=str_replace('[/quote]', '</td></tr></table>', $message); //Echo out the new $message echo $message; ?>` Now, you probably might have noticed at one point or another, that if you submit something, and you're using a text area, that when you press the enter key, it won't make a <br />. Say you had a small shoutbox or something, and you wanted to allow people to make line breaks, you could use str_replace to do that. PHP Code: `<?php //Set a value for $message $message="Line one Line 2"; //Set value for line breaks $message=str_replace(chr(13), '<br />', $message); //Echo out the new $message echo $message; ?>` And you'll see that now, we aren't converting html, we're converting chr(13). That is because the enter key is equal to chr(13), so everytime it finds a line break, it will convert it to a <br />. Finally, i'll show you how to disallow HTML, in a submitted post. Say you didn't want to allow people to post html, because it could mess up your layout or something. You could just do this: PHP Code: `<?php //Set a value for $message $message="<b>Bold Text</b>"; //Disallow html $message=str_replace('<', '<', $message); $message=str_replace('>', '>', $message); //Echo the new $message echo $message; ?>` Those will convert < and > into < and > except on the users side, not as html. I hope this was helpful for you And if you have any questions, don't hesitate to ask! __________________ Kingdoms Of Battle << Check out my free to play online strategy game! SomeCoders - Coding blog, coding tips

17-04-2005, 00:48	#3 (permalink)
Shwaza WMT Addict Join Date: Apr 2005 Posts: 120 iTrader: 0 / 0%	And there goes tim ruining my tuts as always :P __________________ Kingdoms Of Battle << Check out my free to play online strategy game! SomeCoders - Coding blog, coding tips

17-04-2005, 02:10	#5 (permalink)
mck9235 poke poke Join Date: Apr 2005 Posts: 134 iTrader: 0 / 0%	I'm never posting tutorials again, Tim is just too scary. I thought it was cool Shwaza. __________________ \| - The Fast Track - \| Thanks to WMT for the new domain!

17-04-2005, 02:27	#6 (permalink)
Departed Senior Member Join Date: Apr 2005 Posts: 1,088 iTrader: 0 / 0%	Yeah, nice one shwaza. Keep it up. __________________ -Gary

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16-04-2005, 14:38	#2 (permalink)
Tim Cool Newbie Join Date: Apr 2005 Posts: 32 iTrader: 0 / 0%	Actually, I'll be mean and critisize your ideas. First off, what if someone decided to just put a , and not finish it with a ? Then the whole rest of your page would be bold, completely recking it. This is why most BBCode systems use pattern replacing instead of straight out string replacing. Second, your html break codes could be simplified by using the nl2br() function. Third, you should A: put your html remover before all of your bbcode is replaced, and B: The removing of the tags -- and a bunch of other stuff -- can be simplified with the htmlentities() function. That's all, folks.

17-04-2005, 00:49	#4 (permalink)
Tim Cool Newbie Join Date: Apr 2005 Posts: 32 iTrader: 0 / 0%	You betcha