php擷取上傳檔案類型 擷取檔案尾碼

代碼如下

複製代碼

//獲得圖片的格式，包括jpg,png,gif function get_type($img_name)//擷取影像檔類型 {  if (preg_match("/.(jpg|jpeg|gif|png|bmp)$/i", $img_name, $matches)){   $type = strtolower($matches[1]);  }else{   $type = "string";  }  return $type; } //判斷上傳檔案類型 $allowedextensions = array("txt","csv","htm","html","xml",       "css教程","doc","xls","rtf","ppt","pdf","swf","flv","avi",       "wmv","mov","jpg","jpeg","gif","png");        foreach ($_files as $file) {       if ($file['tmp_name'] > '') {         if (!in_array(end(explode(".",               strtolower($file['name']))),               $allowedextensions)) {          die($file['name'].' is an invalid file type!<br/>'.           '<a href="網頁特效:history.go(-1);">'.           '&lt;&lt go back</a>');         }   }   }   //另類的讀取檔案與圖片類型 function checktitle($filename) { $file     = fopen($filename, "rb"); $bin      = fread($file, 2); //唯讀2位元組 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:  $filetype = 'unknown'.$typecode; } //fix if ($strinfo['chars1']=='-1' && $strinfo['chars2']=='-40' ) { return 'jpg'; } if ($strinfo['chars1']=='-119' && $strinfo['chars2']=='80' ) { return 'png'; } return $filetype; }

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