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function hilite_php($text) {

	$erg = split('\[/?php\]', $text);
	for($i=1;$i<count($erg);$i=$i+2) {
		$erg2[] = $erg[$i];
	}
	for($i=0;$i<count($erg2);$i++) {
		$text = str_replace('[php]'.$erg2[$i].'[/php]', highlight_string($erg2[$i], true), $text);
	}
	return $text;
}

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$text='Test Text ... blubb [php]<?php phpinfo(); ?>[/php] ..lala[php]<?=$lala ?>[/php]..';

echo hilite_php($text);

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

 $code = str_replace(">", ">", $code);
 $code = str_replace("&lt;", "<", $code);
 $code = str_replace("&amp;", "&", $code);
 $code = str_replace("[URL]", "", $code);
 $code = str_replace("[/URL]", "", $code);
 $code = str_replace("&quot;", "\"", $code);
 $code = str_replace('$', '\$', $code);
 $code = str_replace("<br>", "", $code);
 $code = str_replace("<br />", "", $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("<br />", "\n", $return);
 $return    = str_replace("\t", "", $return);
 
 $codeteile = preg_split('#\n#', $return);
 $laenge    = sizeof($codeteile);
 
 for($j=0;$j<sizeof($codeteile);$j++) {  
  $zeile = $j + 1;  
  if($j < ($laenge -1)) {
   $linenumbers .= "$zeile: \n";
  } else {
   $linenumbers .= "$zeile:";
  }
 }
 
 /*
 * Daten ausgeben (TPL-Engine):
 */

 global $template;
 
 $charray = array(
          "{code}"        => $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);