FileExt.class.php
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<?php
class Util_Common_Io_FileExt
{
private static $mExtCode = null;
private static $mExtMine = null;
/**
* 获取扩展
*
* @param string $fileName
* @return ext
*/
public static function getExt($fileName)
{
self::init();
//文件扩展编码
$fileExtCode = '';
if(file_exists($fileName))
{
if($handle = @fopen($fileName,'rb'))
{
//轻便的咨询文件锁定，设置独占锁定
flock($handle,LOCK_SH);
//读取头信息高位
$fileExtCode = fread($handle, 2);
fclose($handle);
if(strlen($fileExtCode))
{
$fileExtCode = unpack('C2char',$fileExtCode);
$fileExtCode = intval(implode('',$fileExtCode));
}
}
}
return array_search($fileExtCode, self::$mExtCode);
}
/**
* 根据获取扩展
*
* @param string $code
*/
public static function getExtByCode($code)
{
self::init();
return array_search($code, self::$mExtCode);
}
/**
* 获取minetype的扩展名
*
* @param string $mineType
* @param string $extName
* @return array
*/
public static function getMineExts($mineType)
{
self::init();
if(array_key_exists($mineType,self::$mExtMine))
{
return self::$mExtMine[$mineType];
}
else
{
return array();
}
}
/**
*
* @param unknown_type $ext
* @return unknown|string
*/
public static function getMine($ext)
{
self::init();
$mine = '';
if(strlen($ext))
{
foreach(self::$mExtMine as $key=>$value)
{
if(array_search($ext, $value)!==FALSE)
{
$mine = $key;
break;
}
}
}
if(strlen($mine))
{
return $mine;
}
else
{
return 'application/octet-stream';
}
}
/**
* 初始化
*/
private static function init()
{
if(!isset(self::$mExtCode)) {
self::$mExtCode = array(
'gif' =>7173,
'bmp' =>6677,
'tif' =>7373,
'png' =>13780,
'jpg' =>255216,
'dwg' =>6567,
'psd' =>5666,
'rtf' =>12392,
'eml' =>68101,
'dbx' =>-49,
'pst' =>3366,
'mdb' =>83116,
'eps/ps' =>3733,
'pwl' =>-29,
'wpd' =>-187,
'exe' =>7790,
'rar' =>8297,
'xlsx/docx/pptx/zip'=>8075,//信息头一样
'xml' =>6063,
'html' =>6033,
'aspx' =>239187,
'cs' =>117115,
'js' =>119105,
'txt' =>210187,
'sql' =>255254,
'pdf' =>3780,
'xls/doc/ppt'=>-48, //三种信息头一样
'wav' =>8765,
'avi' =>6586,
'ram' =>46114,
'rm' =>4682,
'mov' =>109111,
'asf' =>4838,
'mid' =>7784,
'swf' =>6787,
'chm' =>7384,
'gz' =>31,
);
}
if(!isset(self::$mExtMine)) {
self::$mExtMine = array(
'video/x-msvideo' => array('avi'),
'audio/x-aiff' => array('aif','aiff','aifc'),
'audio/basic' => array('au','snd'),
'application/postscript' => array('ai','eps','ps'),
'application/astound' => array('asd','asn'),
'application/octet-stream' => array('rar','bin','exe','com','dll','class'),
'application/x-macbinary' => array('bin'),
'text/comma-separated-values' => array('csv'),
'text/css' => array('css'),
'application/acad' => array('dwg'),
'application/dxf' => array('dxf'),
'application/x-director' => array('dcr','dir','dxr'),
'application/msword' => array('doc','dot'),
'application/vnd.openxmlformats-officedocument.wordprocessingml.document'=>array('docx'),
'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'=>array('xlsx'),
'application/vnd.openxmlformats-officedocument.presentationml.presentation'=>array('pptx'),
'application/gzip' => array('gz'),
'image/gif' => array('gif'),
'application/mshelp' => array('hlp','chm'),
'text/html' => array('htm','html','shtml'),
'text/xml' => array('xml'),
'text/javascript' => array('js'),
'image/jpeg' => array('jpeg','jpg','jpe'),
'image/png' => array('png'),
'image/bmp' => array('bmp'),
'video/mpeg' => array('mpeg','mpg','mpe'),
'audio/mpeg' => array('mp3'),
'audio/mp4' => array('m4a'),
'audio/amr' => array('amr'),
'video/quicktime' => array('qt','mov'),
'application/msaccess' => array('mdb'),
'application/mspowerpoint' => array('ppt','ppz','pps','pot'),
'application/pdf' => array('pdf'),
'application/rtf' => array('rtf'),
'text/richtext' => array('rtx'),
'audio/x-pn-realaudio' => array('ram','rm'),
'application/vnd.rn-realmedia' => array('rm','rmvb'),
'application/x-shockwave-flash' => array('swf','cab'),
'text/plain' => array('txt'),
'application/msexcel' => array('xls','xla'),
'application/x-compress' => array('z'),
'application/zip' => array('zip'),
);
}
}
}
?>