Dealing with content of a posted message

Copy and paste the following codes into your editor and run it (code comments are included).

If you want to see the live result (we believe this is the best way to learn what is the script about), try it here (new window).

The online html form

The following script takes a posted message, analyses the content in order to transform specific tags into html and deals about mysql backup for the message.
This kind of script can easily be implemented within forum/blogs...

<html>
<body>
<h1>Dealing with content of a message</h1>
<p>
Following are the tags you can include within your message:
</p>
<p>
"[B]", "[/B]", "[U]","[/U]","[I]","[/I]","[color:red]","[/color]","[/size]","[size:xx-small]","[color:blue]","[color:cyan]","[color:brown]","[color:yellow]","[color:green]","[color:orange]","[size:small]","[size:x-small]","[size:large]","[size:x-large]","[url]","[\url]"
</p>

<p>Each one will be interpreted as follow:</p>
<p>
&quot;&lt;b&gt;&quot;, &quot;&lt;/b&gt;&quot;, &quot;&lt;u&gt;&quot;,&quot;&lt;/u&gt;&quot;,&quot;&lt;i&gt;&quot;,&quot;&lt;/i&gt;&quot;,&quot;&lt;font color=\&quot;red\&quot;&gt;&quot;,&quot;&lt;/font&gt;&quot;,&quot;&lt;/font&gt;&quot;,&quot;&lt;font size=\&quot;xx-small\&quot;&gt;&quot;,&quot;&lt;font color=\&quot;blue\&quot;&gt;&quot;,&quot;&lt;font color=\&quot;cyan\&quot;&gt;&quot;,&quot;&lt;font color=\&quot;brown\&quot;&gt;&quot;,&quot;&lt;font color=\&quot;yellow\&quot;&gt;&quot;,&quot;&lt;font color=\&quot;green\&quot;&gt;&quot;,&quot;&lt;font color=\&quot;orange\&quot;&gt;&quot;,&quot;&lt;font size=\&quot;small\&quot;&gt;&quot;,&quot;&lt;font size=\&quot;x-small\&quot;&gt;&quot;,&quot;&lt;font size=\&quot;large\&quot;&gt;&quot;,&quot;&lt;font size=\&quot;x-large\&quot;&gt;&quot;,&quot;&lt;a href=...&gt;&quot;,&quot;&lt;/a&gt;&quot;
</p>


<form method="post" action="msgforum.php">
<textarea name="msg" rows="10" cols="50" maxlength="255">
input your message right here...
</textarea>
<br />
<input type="submit" value="Send" />
</form>

</body>
</html>

download the file

The main script

<?
error_reporting(E_ALL);
ini_set("display_errors","On");

/*We keep the original message inside a variable:*/
$mystr= $_POST['msg'];

/*Array containing all tags to interpret (can add or remove some)*/
$txt0 = array("[B]", "[/B]", "[U]","[/U]","[I]","[/I]","\\r\\n","[color:red]","[/color]","[/size]","[size:xx-small]","[color:blue]","[color:cyan]","[color:brown]","[color:yellow]","[color:green]","[color:orange]","[size:small]","[size:x-small]","[size:large]","[size:x-large]","\r\n");
$txt1 = array("<b>", "</b>", "<u>","</u>","<i>","</i>","<br/>","<font color=\"red\">","</font>","</font>","<font size=\"xx-small\">","<font color=\"blue\">","<font color=\"cyan\">","<font color=\"brown\">","<font color=\"yellow\">","<font color=\"green\">","<font color=\"orange\">","<font size=\"small\">","<font size=\"x-small\">","<font size=\"large\">","<font size=\"x-large\">","<br/>");

/*number of tags*/
$i=21;

/*This function takes care of the urls inside the [url] tags and all other tags using the str_replace php function*/
function ChangeString($var)
{
		global $txt0,$txt1;

		$var=str_replace($txt0, $txt1,$var);

		preg_match_all("|\[url\](.*)\[\/url\]|U",$var, $results,PREG_SET_ORDER);
		foreach ($results as $val) 
		{
			$var=str_replace($val[0],'<a href="'.$val[1].'" target="_blank">...'.substr($val[1],-20).'</a>',$var);
		}

		return $var;

}

/*Function which takes care of the [code] tag (see forum use) - ***another approach could be done with the preg_match function (next update!)***/
function CodeStr($strtocode)
{
	$var=trim($strtocode);
	$coded='';
	$position=0;
	$mainposition=0;
	

	while(($pos=strpos($var,"[code]")) !== FALSE)
	{
		$coded.=ChangeString(strip_tags(substr($var,0,$pos))).'<div class="coding">';
		$var=substr($var,$pos+6);
		$tempvar=$var;
		$position=0;
		$boole=1;

		$mainposition+=$pos+6;	

		while($boole)
		{
			if((($posend=strpos($tempvar,"[/code]")) !== FALSE))
			{
				$position+=$posend;

				if(($tempos=strpos($tempvar,"[code]")) === FALSE)
				{
					$boole=0;				
					$coded.=htmlentities(substr($tempvar,0,$posend),ENT_QUOTES).'</div>';
					$var=substr($tempvar,$posend+7);
					$tempvar=$var;
					$position+=7;

					$mainposition+=$posend+7;

				}
				else
				{
					if($tempos > $posend)
					{
						$boole=0;				
						$coded.=htmlentities(substr($var,0,$posend),ENT_QUOTES).'</div>';
						$var=substr($tempvar,$posend+7);						
						
						$mainposition+=$posend+7;						
											
					}	
					else
					{

						$coded.=htmlentities(substr($var,0,$position+7),ENT_QUOTES);
						$var=substr($tempvar,$posend+7);	
						$tempvar=$var;
						
						$mainposition+=$posend+7;
						
					}
				}
			
			}
			else
			{
				/*Here we display the text contained inside [code] tags inside a div*/
				$coded.='<div class="coding">'.htmlentities($var,ENT_QUOTES).'</div>';
				return $coded;
			}
			
		}
	
	}
	
	/*all text contained inside these [code] tags are not parsed to the ChangeString function*/
	return $coded.ChangeString(strip_tags(substr($strtocode,$mainposition,strlen($strtocode))));

}

/*open the database connection - another script (see mysql tutorials)*/
require('openconnection.php');

/*We pass the message through the functions:*/
$_POST['msg']=CodeStr($_POST['msg']);
$_POST['msg']=mysql_real_escape_string($_POST['msg']);

/*Create a title (optional)*/
$title=substr($_POST['msg'],0,20);

/*insertion of the message inside a temporary mysql table - We store a title for the message (optional)*/
mysql_query("CREATE TEMPORARY TABLE temptable(title varchar(25) not null primary key,msg text not null)",$db);
mysql_query("INSERT INTO temptable SET title='{$title}',msg='{$_POST['msg']}'",$db);

/*We echo the result - first the content as it has been entered then the interpreted content retrieved from the database*/
echo $mystr.'<p><hr/>';

$q=mysql_query("SELECT msg FROM temptable",$db);
echo mysql_result($q,0);

/*close the database connection*/
mysql_close($db);
?>

download the file

For details about the different Php functions implemented here, there are interesting pages:
- function.str-replace.php
- function.str-replace.php
- preg_match examples
- temporary tables

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Dealing with content of a posted message

Dealing with content of a posted message

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