1: 
2: 
3: 
4: 
5: 
6: 
7: 
8: 
9: 
10:

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


ob_start("callback");

blablabla, PHP code
    
ob_end_flush();

1: 
2: 
3: 
4: 
5: 
6: 
7: 
8:

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

--highlight_string etc.--

?>

1: 
2: 
3: 
4: 
5: 
6: 
7:

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

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

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

1: 
2: 
3: 
4: 
5: 
6: 
7: 
8: 
9: 
10: 
11: 
12: 
13: 
14: 
15: 
16: 
17: 
18: 
19: 
20: 
21: 
22: 
23: 
24: 
25: 
26: 
27: 
28: 
29: 
30: 
31: 
32: 
33: 
34: 
35: 
36: 
37: 
38: 
39: 
40: 
41: 
42: 
43: 
44: 
45: 
46: 
47: 
48: 
49: 
50: 
51: 
52: 
53: 
54: 
55: 
56: 
57: 
58: 
59: 
60: 
61: 
62: 
63: 
64: 
65: 
66: 
67: 
68: 
69: 
70: 
71: 
72: 
73: 
74:

/**
* 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);