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function callback($buffer) {
     return(highlight_string($buffer));
}


ob_start("callback");

blablabla, PHP code
    
ob_end_flush();

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[/php] ..lalala..";

--highlight_string etc.--

?>

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$text="Test Text ... blubb [php][/php] ..lalala..";

$start="[php]";
$end="[/php]";

$phpcode=substr($text,strpos($text,$start)+strlen($start));
$phpcode=substr($phpcode,0,strpos($phpcode,$end));

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/**
* Funktion zum Parsen von PHP-Code
*/
function parsephp($code) {

 $code = str_replace(">", ">", $code);
 $code = str_replace("<", "<", $code);
 $code = str_replace("&", "&", $code);
 $code = str_replace("[URL]", "", $code);
 $code = str_replace("[/URL]", "", $code);
 $code = str_replace(""", "\"", $code);
 $code = str_replace('$', '\$', $code);
 $code = str_replace("
", "", $code);
 $code = str_replace("
", "", $code);
 
 $code = stripslashes($code);
 
 /*
 * Code parsen:
 */

 ob_start();
 
  $oldlevel = error_reporting(0);
  
  highlight_string($code);
 
  error_reporting($oldlevel);
  
  $buffer = ob_get_contents();
 
 ob_end_clean();
 
 $return    = $buffer;
 
 /*
 * Zeilen berechnen:
 */
 
 $return    = str_replace("
", "\n", $return);
 $return    = str_replace("\t", "", $return);
 
 $codeteile = preg_split('#\n#', $return);
 $laenge    = sizeof($codeteile);
 
 for($j=0;$j $return,
          "{height}"      => $height,
          "{linenumbers}" => $linenumbers
 );

 $outvar = $template->open("php_code", $charray);

 return $outvar;

}
	$phpsearch[] = '/\[php\](.*)\[\/php\]/Uesi';
	$phpreplace[] = 'parsephp(\'\1\')';
	$text = preg_replace($phpsearch, $phpreplace, $text);