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PHP takes binary file header to determine file type

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Release： 2016-07-25 08:54:08

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/**
* PHP takes the binary file header to quickly determine the file type
*
* @param file $file
* @return string
* @author lrenwang
* @blog blog.lrenwang.com
*/
function get_extname($file)
{
$fp = fopen($file, "rb");
$bin = fread($fp, 2); //只读2字节
fclose($fp);
$bin_info = @unpack("C2chars", $bin);
$code = intval($bin_info['chars1'].$bin_info['chars2']);
switch ($code) {
case 7790:
$type = 'exe';
break;
case 7784:
$type = 'midi';
break;
case 8075:
$type = 'zip';
break;
case 8297:
$type = 'rar';
break;
case 255216:
$type = 'jpg';
break;
case 7173:
$type = 'gif';
break;
case 6677:
$type = 'bmp';
break;
case 13780:
$type = 'png';
break;
default:
$type = $code;
break;
}
return $type;
}
?>

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Related labels：

PHP取二进制文件头判断文件类型

source：php.cn

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