Apply these two patches:
http://forums.b2evolution.net/viewtopic.php?p=111268#111268
http://forums.b2evolution.net/viewtopic.php?p=111288#111288

Hello Sam2kb,

thx for help,

I did these two changes except _upgrade.funcs.php was in my installation at /inc/_core/model/db/ and I did paste the change in
_misc.funcs.php at the end but before */?>.

Hope that was o.k.

I'm sorry to say but I get the same error-code as before.

My php is v.4.49

Any idea what else I can try?

micha

You should definitely not see this error

Fatal error: Call to undefined function: array_combine()

Are you sure the file _misc.funcs.php was edited and saved on the server

Hmm,

I've definetly overwritten the file on the server. Maybe I did something wrong with editing. Here is the end of _misc.funcs.php.

function sanitize_id_list( $str, $return_array = false, $quote = false )
{
	// Explode and trim
	$array = array_map( 'trim', explode(',', $str) );

	// Convert to integer and remove all empty values
	$array = array_filter( array_map('intval', $array) );

	if( !$return_array && $quote )
	{	// Quote each element and return a string
		global $DB;
		return $DB->quote($array);
	}
	return ( $return_array ? $array : implode(',', $array) );
}


/**
 * Create json_encode function if it does not exist ( PHP < 5.2.0 )
 *
 * @return string
 */
if ( !function_exists( 'json_encode' ) )
{
	function json_encode( $a = false )
	{
		if( is_null( $a ) )
		{
			return 'null';
		}
		if( $a === false )
		{
			return 'false';
		}
		if( $a === true )
		{
			return 'true';
		}
		if( is_scalar( $a ) )
		{
			if( is_float( $a ) )
			{ // Always use "." for floats.
				return floatval( str_replace( ",", ".", strval( $a ) ) );
			}

			if( is_string( $a ) )
			{
				$jsonReplaces = array( array( "\\", "/", "\n", "\t", "\r", "\b", 

"\f", '"' ), array( '\\\\', '\\/', '\\n', '\\t', '\\r', '\\b', '\\f', '\"' ) );
				return '"'.str_replace( $jsonReplaces[0], $jsonReplaces

[1], $a ).'"';
			}

			return $a;
		}
		$isList = true;
		for( $i = 0, reset($a); $i < count($a); $i++, next($a) )
		{
			if( key($a) !== $i )
			{
				$isList = false;
				break;
			}
		}
		$result = array();
		if( $isList )
		{
			foreach( $a as $v )
			{
				$result[] = json_encode($v);
			}
			return '['.join( ',', $result ).']';
		}
		else
		{
			foreach( $a as $k => $v )
			{
				$result[] = json_encode($k).':'.json_encode($v);
			}
			return '{'.join( ',', $result ).'}';
		}
	}
}
/*
 * $Log: _misc.funcs.php,v $

if (!function_exists('array_combine')) { 
   function array_combine($arr1, $arr2) { 
      $out = array(); 
      $arr1 = array_values($arr1); 
      $arr2 = array_values($arr2); 
      foreach($arr1 as $key1 => $value1) { 
         $out[(string)$value1] = $arr2[$key1]; 
      } 
      return $out; 
   } 
} 
 */
?>

...an here's a link to the error message:
www.medienwerkstatt.eu/members

Ok, you did it wrong :) Notice how the code you added is printed in orange.

remove

/*
 * $Log: _misc.funcs.php,v $

and closing

*/

Ah :D o.k.

I had to overwrite the last line w/out putting the */ at the end.
I'm sorry but my php knowledge is only rudimentary - to say the least. I do things like this only once a year and have always forgotten most of it before year is over... :-/

Thank you very much Sam2kb you made my weekend! :D

No problem :)