php获取文件类型和文件信息的方法

<?php
$file = "php.txt";
//打开文件,r表示以只读方式打开
$handle = fopen($file,"r");
//获取文件的统计信息
$fstat = fstat($handle);
echo "文件名：".basename($file)."<br>";
//echo "文件大小：".round(filesize("$file")/1024,2)."kb<br>";
echo "文件大小：".round($fstat["size"]/1024,2)."kb<br>";
//echo "最后拜访时间：".date("Y-m-d h:i:s",fileatime($file))."<br>";
echo "最后拜访时间：".date("Y-m-d h:i:s",$fstat["atime"])."<br>";
//echo "最后修改时间：".date("Y-m-d h:i:s",filemtime($file))."<br>";
echo "最后修改时间：".date("Y-m-d h:i:s",$fstat["mtime"]);
?>

echo mime_content_type ( 'php.gif' ) . "n" ;
echo mime_content_type ( 'test.php' );

$finfo = finfo_open(FILEINFO_MIME);
$mimetype = finfo_file($finfo,$filename);
finfo_close($finfo);

<?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; 
?>