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I ran into this problem while using json_encode. I use this to get everything into utf8. Source: http://us2.php.net/manual/en/function.json-encode.php

function ascii_to_entities($str) 
 { 
 $count = 1; 
 $out = ''; 
 $temp = array(); 
 
 for ($i = 0, $s = strlen($str); $i < $s; $i++) 
 { 
 $ordinal = ord($str[$i]); 
 
 if ($ordinal < 128) 
 { 
 if (count($temp) == 1) 
 { 
 $out .= '&#'.array_shift($temp).';'; 
 $count = 1; 
 } 
 
 $out .= $str[$i]; 
 } 
 else 
 { 
 if (count($temp) == 0) 
 { 
 $count = ($ordinal < 224) ? 2 : 3; 
 } 
 
 $temp[] = $ordinal; 
 
 if (count($temp) == $count) 
 { 
 $number = ($count == 3) ? (($temp['0'] % 16) * 4096) + 
(($temp['1'] % 64) * 64) + 
($temp['2'] % 64) : (($temp['0'] % 32) * 64) + 
($temp['1'] % 64); 
 $out .= '&#'.$number.';'; 
 $count = 1; 
 $temp = array(); 
 } 
 } 
 } 
 return $out; 
 }