- //检测文件类型
- //by http://bbs.it-home.org
- function checkFileType($filename){
- //文件头
- $_typecode = array(
- '3780',//PDF
- '8075',//.docx,.xlsx,.pptx,.potx,.vsdx,.odt
- '208207',//.doc,.xls,.ppt,.vsd,.pot,.wps,.dps,.et
- );
- $file = fopen($filename, "rb");
- //contents = stream_get_contents($file);
- //$contents = fread($file, filesize($filename));
- $bin = fread($file, 2); //只读2字节
- fclose($file);
- $strInfo = @unpack("C2chars", $bin);// C为无符号整数，网上搜到的都是c，为有符号整数，这样会产生负数判断不正常
- $typeCode = intval($strInfo['chars1'].$strInfo['chars2']);
- exec("file $filename",$output,$return_var);//用linux系统命令file判断上传文件的类型,主要是判断txt,rtf文件类型
- $pattern = '/text,/';//rtf和txt文档用file检测都会被检测为text
- $_count = preg_match($pattern,strrchr($output[0],":"));
- echo $typeCode;
- if(in_array($typeCode,$_typecode) || $_count == 1) {
- return true;
- }else{
- return false;
- }
- }
- ?>
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