如何使用PHP將上傳的swf文件存儲在MySQL數據庫中？

Question

如何使用PHP將上傳的swf文件存儲在MySQL數據庫中？

Answer 1

最好的方法是將文件存儲在磁盤上，然後在數據庫中存儲元數據（如文件名，可能還有其他字段，例如上傳器）。這樣你將得到一個更快的數據庫，因爲你不需要在表中有大的BLOB字段，並且你還可以更快地提供這些文件，因爲它們可以直接從磁盤讀取，而不是通過網絡上的MySQL連接發送。

所以當文件上傳時，給它一個唯一的文件名並將其存儲在磁盤上的文件夾中。然後將元數據（包括唯一文件名）存儲在數據庫中。如果您在定義唯一文件名時遇到問題，請先保存元數據並在數據庫中使用AUTOINCREMENTed列作爲文件名。

Answer 2

// here u can upload swf files also 

<?php 
//define a maxim size for the uploaded images in Kb 
define ("MAX_SIZE","100"); 

//This function reads the extension of the file. It is used to determine if the file is an image by checking the extension. 
function getExtension($str) { 
     $i = strrpos($str,"."); 
     if (!$i) { return ""; } 
     $l = strlen($str) - $i; 
     $ext = substr($str,$i+1,$l); 
     return $ext; 
} 

//This variable is used as a flag. The value is initialized with 0 (meaning no error found) 
//and it will be changed to 1 if an errro occures. 
//If the error occures the file will not be uploaded. 
$errors=0; 
//checks if the form has been submitted 
if(isset($_POST['Submit'])) 
{ 
    //reads the name of the file the user submitted for uploading 
    $image=$_FILES['image']['name']; 
    //if it is not empty 
    if ($image) 
    { 
    //get the original name of the file from the clients machine 
     $filename = stripslashes($_FILES['image']['name']); 
    //get the extension of the file in a lower case format 
     $extension = getExtension($filename); 
     $extension = strtolower($extension); 
    //if it is not a known extension, we will suppose it is an error and will not upload the file, 
    //otherwise we will do more tests 
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif") && ($extension != "swf")) 
     { 
     //print error message 
      echo '<h1>Unknown extension!</h1>'; 
      $errors=1; 
     } 
     else 
     { 
//get the size of the image in bytes 
//$_FILES['image']['tmp_name'] is the temporary filename of the file 
//in which the uploaded file was stored on the server 
$size=filesize($_FILES['image']['tmp_name']); 

//compare the size with the maxim size we defined and print error if bigger 
if ($size > MAX_SIZE*1024) 
{ 
    echo '<h1>You have exceeded the size limit!</h1>'; 
    $errors=1; 
} 

//we will give an unique name, for example the time in unix time format 
$image_name=time().'.'.$extension; 
//the new name will be containing the full path where will be stored (images folder) 
$newname="images/".$image_name; 
//we verify if the image has been uploaded, and print error instead 
$copied = copy($_FILES['image']['tmp_name'], $newname); 
if (!$copied) 
{ 
    echo '<h1>Copy unsuccessfull!</h1>'; 
    $errors=1; 
}}}} 


//If no errors registred, print the success message 
if(isset($_POST['Submit']) && !$errors) 
{ 
    echo "<h1>File Uploaded Successfully! Try again!</h1>"; 


} 

?> 

<!--next comes the form, you must set the enctype to "multipart/frm-data" and use an input type "file" --> 
<form name="newad" method="post" enctype="multipart/form-data" action=""> 
<table> 
    <tr><td><input type="file" name="image"></td></tr> 
    <tr><td><input name="Submit" type="submit" value="Upload image"></td></tr> 
</table> 
</form>