解码mime邮件的代码

答案：function decode_mime_string ($string) { 
$pos = strpos($string, '=?'); 
if (!is_int($pos)) { 
return $string; 
} 

$preceding = substr($string, 0, $pos); // save any preceding text 

$search = substr($string, $pos+2, 75); /* the mime header spec says this is the longest a single encoded word can be */ 
$d1 = strpos($search, '?'); 
if (!is_int($d1)) { 
return $string; 
} 

$charset = substr($string, $pos+2, $d1); 
$search = substr($search, $d1+1); 

$d2 = strpos($search, '?'); 
if (!is_int($d2)) { 
return $string; 
} 

$encoding = substr($search, 0, $d2); 
$search = substr($search, $d2+1); 

$end = strpos($search, '?='); 
if (!is_int($end)) { 
return $string; 
} 

$encoded_text = substr($search, 0, $end); 
$rest = substr($string, (strlen($preceding . $charset . $encoding . $encoded_text)+6)); 

switch ($encoding) { 
case 'Q': 
case 'q': 
$encoded_text = str_replace('_', '%20', $encoded_text); 
$encoded_text = str_replace('=', '%', $encoded_text); 
$decoded = urldecode($encoded_text); 

if (strtolower($charset) == 'windows-1251') { 
$decoded = convert_cyr_string($decoded, 'w', 'k'); 
} 
break; 

case 'B': 
case 'b': 
$decoded = urldecode(base64_decode($encoded_text)); 

if (strtolower($charset) == 'windows-1251') { 
$decoded = convert_cyr_string($decoded, 'w', 'k'); 
} 
break; 

default: 
$decoded = '=?' . $charset . '?' . $encoding . '?' . $encoded_text . '?='; 
break; 
} 

return $preceding . $decoded . decode_mime_string($rest); 
} // decode_mime_string() 

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