僅製作附件文件格式.txt .doc .docx

Question

我使用幫助聯機教程創建了帶有文件附件的PHP聯繫表單。但我想像用戶一樣只能上傳.txt .doc .docx文件格式，不會接受其他格式。

<?php 
$from = "name@example.com"; 
$to = $_POST['email']; 
$subject =$_POST['subject']; 
$message = $_POST['body']; 

// Temporary paths of selected files 
$file1 = $_FILES['file1']['tmp_name']; 
$file2 = $_FILES['file2']['tmp_name']; 
$file3 = $_FILES['file3']['tmp_name']; 

// File names of selected files 
$filename1 = $_FILES['file1']['name']; 
$filename2 = $_FILES['file2']['name']; 
$filename3 = $_FILES['file3']['name']; 

// array of filenames to be as attachments 
$files = array($file1, $file2, $file3); 
$filenames = array($filename1, $filename2, $filename3); 

// include the from email in the headers 
$headers = "From: $from"; 

// boundary 
$time = md5(time()); 
$boundary = "==Multipart_Boundary_x{$time}x"; 

// headers used for send attachment with email 
$headers .= "\nMIME-Version: 1.0\n" . "Content-Type: multipart/mixed;\n" . " boundary=\"{$boundary}\""; 

// multipart boundary 
$message = "--{$boundary}\n" . "Content-Type: text/plain; charset=\"iso-8859-1\"\n" . "Content-Transfer-Encoding: 7bit\n\n" . $message . "\n\n"; 
$message .= "--{$boundary}\n"; 

// attach the attachments to the message 
for($x=0; $x<count($files); $x++){ 
    $file = fopen($files[$x],"r"); 
    $content = fread($file,filesize($files[$x])); 
    fclose($file); 
    $content = chunk_split(base64_encode($content)); 
    $message .= "Content-Type: {\"application/octet-stream\"};\n" . " name=\"$files[$x]\"\n" . 
     "Content-Disposition: attachment;\n" . " filename=\"$filenames[$x]\"\n" . 
     "Content-Transfer-Encoding: base64\n\n" . $content . "\n\n"; 
    $message .= "--{$boundary}\n"; 
} 

// sending mail 
$sendmail = mail($to, $subject, $message, $headers); 

// verify if mail is sent or not 
if ($sendmail) { 
    echo "Sent successfully!"; 
} else { 
    echo "Error occurred. Try again!"; 
} 
?> 

Answer 1

使用$ _FILE的[「文件名」] [「型」]下不推薦用於文件類型檢查的類型參數是針對特定瀏覽器即不同的瀏覽器可以有不同的類型，因此，我們將嘗試提取格式從字符串功能

$filename=$_FILES["file1"]["name"];//get the name of the file 
$extension=strrchr($filename, ".");//extracting the extension 

if($extension=".txt" || $extension=".doc" || $extension=".docx") 
{ 
//send mail; 
} 
else 
{ 
//error; 
} 

Answer 2

function allowed_file(){ 

    //Add the allowed mime-type files to an 'allowed' array 
    $allowed = array('application/doc', 'application/txt', 'another/type'); 

    //Check uploaded file type is in the above array (therefore valid) 
    if(in_array($_FILES['file']['name'], $allowed)) 
     { 
     // Your code 
      } 

} 

參考：php file upload, how to restrict file upload type

Answer 3

簡單，

$filename_array = explode(".",$filename); 
$ext = ".".$filename_array[count($filename_array)-1]; 
if($ext!==".txt" && $ext!==".doc" && $ext!==".docx"): 
    //Do bad extension code 
endif; 
//Do code that passed extension validation 

希望這有助於！

Answer 4

$allowed = array('.txt', '.doc', '.docx') 
$fileNames = array(); 

$filename1= $_FILES['file1']['name']; 
$ext1 = pathinfo($path, PATHINFO_EXTENSION); 

if(in_array($ext1, $allowed)){ 
    array_push($fileNames, $filename1); //repeat for 2, 3, etc... 
}