Created
          April 3, 2012 00:05 
        
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    Detect charset from MIME string
  
        
  
    
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  | /** | |
| * Detect charset from MIME string | |
| * | |
| * @params string | |
| * @return mixed found a charset string (upper case) or couldn't found false | |
| */ | |
| public function getCharsetFromMimeString($mimeString) { | |
| $mimeString = trim($mimeString); | |
| if (preg_match('/^=\?([^?]+)\?(:?B|Q)\?[^?]+\?=$/', $mimeString, $matched)){ | |
| return strtoupper($matched[1]); | |
| } | |
| return false; | |
| } | 
  
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ツッコミありがとうございます! false にします。
実はソコのところを迷ってたのですが、とりあえず null にしてました。