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PHP 文件类型判断代码

　　本文标签：PHP,文件类型

<?php
$filename = "D:\\296.mid";
$file = fopen($filename, "rb");
$bin = fread($file, 2); //只读2字节
fclose($file);
$strInfo = @unpack("c2chars", $bin);
$typeCode = intval($strInfo[chars1].$strInfo[chars2]);
$fileType = ;
switch ($typeCode)
{
case 7790:
$fileType = exe;
break;
case 7784:
$fileType = midi;
break;
case 8297:
$fileType = rar;
break;
case 255216:
$fileType = jpg;
break;
case 7173:
$fileType = gif;
break;
case 6677:
$fileType = bmp;
break;
case 13780:
$fileType = png;
break;
default:
echo unknown;
}
echo this is a(an) .$fileType. file:.$typeCode;
?>