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最新推荐文章于 2024-03-18 16:36:18 发布

转载最新推荐文章于 2024-03-18 16:36:18 发布 · 701 阅读

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<?php
function file_type($filename)
{
    $file = fopen($filename, "rb");
    $bin = fread($file, 2); //只读2字节
    fclose($file);
   print_r($bin);
    $strInfo = @unpack("C2chars", $bin);
   print_r($strInfo);
    $typeCode = intval($strInfo['chars1'].$strInfo['chars2']);
    $fileType = '';
    switch ($typeCode)
    {
        case 7790:
            $fileType = 'exe';
            break;
        case 7784:
            $fileType = 'midi';
            break;
        case 8297:
            $fileType = 'rar';
            break;
        case 8075:
            $fileType = 'zip';
            break;
        case 255216:
            $fileType = 'jpg';
            break;
        case 7173:
            $fileType = 'gif';
            break;
        case 6677:
            $fileType = 'bmp';
            break;
        case 13780:
            $fileType = 'png';
            break;
        default:
            $fileType = 'unknown: '.$typeCode;
    }

    if ($strInfo['chars1']=='-1' AND $strInfo['chars2']=='-40' ) return 'jpg';
    if ($strInfo['chars1']=='-119' AND $strInfo['chars2']=='80' ) return 'png';

    return $fileType;
}
echo file_type('sdf.jpg');