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PHP二进制判断文件类型

Jun 06, 2016 pm 07:47 PM
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欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入 一般我们都是按照文件扩展名来判断文件类型,但是这个很不靠谱,轻易就通过修改扩展名来躲避了,一般必须要读取文件信息来识别。 ?php $files = array('./test.jpg', 'test.png'); $fileTypes = a

欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入

  一般我们都是按照文件扩展名来判断文件类型,但是这个很不靠谱,轻易就通过修改扩展名来躲避了,一般必须要读取文件信息来识别。

  

  $files = array('./test.jpg', 'test.png');

  $fileTypes = array(

  7790    => 'exe',

  7784    => 'midi',

  8075    => 'zip',

  8297    => 'rar',

  225216  => 'jpg',

  7173    => 'gif',

  6677    => 'bmp',

  13780   => 'png',

  );

  foreach($files as $file) {

  $fp = fopen($file, 'rb');

  $bin = fread($fp, 2); // 只读头两个字节

  fclose($fp);

  $strInfo = @unpack("C2chars", $bin);

  $typeCode = intval($strInfo['chars1'].$strInfo['chars2']);

  $fileType = isset($fileTypes[$typeCode]) ? $fileTypes[$typeCode] : 'unknown';

  echo $file , ' type : ', $fileType, ' code : ', $fileType, '
';

  }

PHP二进制判断文件类型

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