在PHP中上傳多個文件

Question

我想知道是否有人能夠幫助我。

使用一些優秀的在線教程，我將下面的代碼放在一起，允許用戶將圖像文件上傳到服務器文件夾，並將文件名和其他細節上傳到mySQL數據庫。

PHP腳本

<?php 
//define a maxim size for the uploaded images 
//define ("MAX_SIZE","100"); 
// define the width and height for the thumbnail 
// note that theese dimmensions are considered the maximum dimmension and are not fixed, 
// because we have to keep the image ratio intact or it will be deformed 
define ("WIDTH","150"); 
define ("HEIGHT","100"); 

// this is the function that will create the thumbnail image from the uploaded image 
// the resize will be done considering the width and height defined, but without deforming the image 
function make_thumb($img_name,$filename,$new_w,$new_h) 
{ 
//get image extension. 
$ext=getExtension($img_name); 
//creates the new image using the appropriate function from gd library 
if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext)) 
$src_img=imagecreatefromjpeg($img_name); 

if(!strcmp("png",$ext)) 
$src_img=imagecreatefrompng($img_name); 

//gets the dimmensions of the image 
$old_x=imageSX($src_img); 
$old_y=imageSY($src_img); 

// next we will calculate the new dimmensions for the thumbnail image 
// the next steps will be taken: 
// 1. calculate the ratio by dividing the old dimmensions with the new ones 
// 2. if the ratio for the width is higher, the width will remain the one define in WIDTH variable 
// and the height will be calculated so the image ratio will not change 
// 3. otherwise we will use the height ratio for the image 
// as a result, only one of the dimmensions will be from the fixed ones 
$ratio1=$old_x/$new_w; 
$ratio2=$old_y/$new_h; 
if($ratio1>$ratio2) { 
$thumb_w=$new_w; 
$thumb_h=$old_y/$ratio1; 
} 
else { 
$thumb_h=$new_h; 
$thumb_w=$old_x/$ratio2; 
} 

// we create a new image with the new dimmensions 
$dst_img=ImageCreateTrueColor($thumb_w,$thumb_h); 

// resize the big image to the new created one 
imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 

// output the created image to the file. Now we will have the thumbnail into the file named by $filename 
if(!strcmp("png",$ext)) 
imagepng($dst_img,$filename); 
else 
imagejpeg($dst_img,$filename); 

//destroys source and destination images. 
imagedestroy($dst_img); 
imagedestroy($src_img); 
} 

// 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; 
} 
$title = ($_POST['title']); 

if ($title == '') // if title is not set 
$title = '(No Title Provided)';// use (empty title) string 
//reads the name of the file the user submitted for uploading 
$image=$_FILES['image']['name']; 

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, print an error message 
//and will not upload the file, otherwise we continue 
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png")) 
{ 
echo '<b> Error! </b> - The image that you attempted to upload is not in the correct format. The file format <b> must </b> be one of the following: <b> "jpg", "jpeg" </b> or <b> "png" </b>. Please try again.'; 
$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 
$size=getimagesize($_FILES['image']['tmp_name']); 
$sizekb=filesize($_FILES['image']['tmp_name']); 

//compare the size with the maxim size we defined and print error if bigger 
if ($sizekb > 1150000) 
{ 
echo '<b> Error! </b> - The file that you are attempting to upload is greater than the prescribed <b> 1MB </b> limit. Please try again.'; 
$errors=1; 
} 

//we will give an unique name, for example the time in unix time format 
$image_name=time().'.'.$title.'.'.$extension; 
//the new name will be containing the full path where will be stored (images folder) 
$newname="images/".$image_name; 
$copied = copy($_FILES['image']['tmp_name'], $newname); 
if (!$copied) 
{ 
//echo '<b> Error! </b> Your file has not been loaded'; 
//$errors=1; 
} 
else 
{ 
// the new thumbnail image will be placed in images/thumbs/ folder 
$thumb_name='images/thumbs/'.$image_name; 
// call the function that will create the thumbnail. The function will get as parameters 
//the image name, the thumbnail name and the width and height desired for the thumbnail 
$thumb=make_thumb($newname,$thumb_name,WIDTH,HEIGHT); 
} }} 

//If no errors registred, print the success message and show the thumbnail image created 
if(isset($_POST['Submit']) && !$errors) 
{ 
//echo '<br><b> Success! </b> - Your image has been uploaded</br>'; 
//echo '<img src="'.$thumb_name.'">'; 
} 
require("mapmyfindsdbinfo.php"); 
// Gets data from form 
$userid = $_POST["userid"]; 
$locationid = $_POST["locationid"]; 
$findosgb36lat = $_POST["findosgb36lat"]; 
$findosgb36lon = $_POST["findosgb36lon"]; 
$dateoftrip = $_POST["dateoftrip"]; 
$findcategory = $_POST["findcategory"]; 
$findname = $_POST["findname"]; 
$finddescription = $_POST["finddescription"]; 
$detectorid= $_POST["detectorname"]; 
$searchheadid = $_POST["searchheadname"]; 
if(empty($_POST["detectorsettings"])) {  
$detectorsettings = 'No details provided.'; } else {  
$detectorsettings = $_POST["detectorsettings"]; } 
if(empty($_POST["pasref"])) {  
$pasref = 'No PAS Ref. number provided.'; } else {  
$pasref = $_POST["pasref"]; } 
if(empty($_POST["additionalcomments"])) {  
$additionalcomments = 'No additional comments made.'; } else {  
$additionalcomments = $_POST["additionalcomments"]; } 
$makepublic = $_POST["makepublic"]; 

// Opens a connection to a MySQL server 
$conn = mysql_connect ("hostname", $username, $password); 
if (!$conn) { 
    die('Not connected : ' . mysql_error()); 
} 

// Set the active MySQL database 
$db_selected = mysql_select_db($database, $conn); 
if (!$db_selected) { 
    die ('Can\'t use db : ' . mysql_error()); 
} 

$sql = "INSERT INTO finds (userid, locationid, findosgb36lat, findosgb36lon, dateoftrip, findcategory, findname, finddescription, detectorid, searchheadid, detectorsettings, pasref, additionalcomments, makepublic) VALUES ('$userid', '$locationid', '$findosgb36lat', '$findosgb36lon', '$dateoftrip', '$findcategory', '$findname', '$finddescription', '$detectorid', '$searchheadid', '$detectorsettings', '$pasref', '$additionalcomments', '$makepublic')"; 
$result = mysql_query($sql, $conn); 

$findid = mysql_insert_id($conn); 

$sql = "INSERT INTO testimages (title, imagename, findid) VALUES ('$title', '$image_name', '$findid')"; 
$result = mysql_query($sql, $conn); 

if (!$result) { 
    die('Invalid query: ' . mysql_error()); 
} 

?> 

HTML表單

<form name="savemyfindstolocation" method="post" enctype="multipart/form-data" action="savemyfindstolocation.php"> 
    <p align="left">Do You Wish To Add Find Images<label></label> 
     <label></label> 
    </p> 
    <div align="left"> 
     <table id="addfiletable" border="1" style="table-layout:auto"> 
      <tr> 
       <td>&nbsp;</td> 
       <td><div align="center">Title</div></td> 
       <td><div align="center">File Location </div></td> 
      </tr> 
      <tr> 
       <td width="20"><input name="select" type="radio" id="select" title=""/></td> 
       <td width="144"><input name="title" type="text" id="title"/></td> 
       <td width="314"><input name="image" type="file" id="image" onchange="addRow();" size="40"/></td> 
      </tr> 
     </table> 
     <div align="justify"> 
      <input type="submit" name="deleterow" value="Delete Row" /> 
     </div> 
    </div> 
    <input name="submit" type="submit" value="Submit" />   
</form> 

這一切運作良好，但我現在想延長允許用戶上傳超過1的功能文件一次。我已經做了一些研究，看看如何上傳多個文件，但我對PHP相當陌生，並且有些不確定哪種方法是最好的方法。

我只是想知道是否有人可以看看我放在一起的東西，並提供一些指導，說明如何在表單提交時將其更改爲上載多個文件。

非常感謝

Answer 1

PHP

foreach($_FILES['image']['name'] as $i => $name) 
{ 
    // now $name holds the original file name 
    $tmp_name = $_FILES['image']['tmp_name'][$i]; 
    $error = $_FILES['image']['error'][$i]; 
    $size = $_FILES['image']['size'][$i]; 
    $type = $_FILES['image']['type'][$i]; 

    if($error === UPLOAD_ERR_OK) 
    { 
     $extension = getExtension($name); 
     if(! in_array(strtolower($extension, array('jpg', 'jpeg', 'png')) 
     { 
      // Error, invalid extension detected 
     } 
     else if ($size > $maxAllowedFileSize /* needs to be defined elsewhere */) 
     { 
      // Error, file too large 
     } 
     else 
     { 
      // No errors 
      $newFileName = 'foo'; // You'll probably want something unique for each file. 
      if(move_uploaded_file($tmp_file, $newFileName)) 
      { 
       // Uploaded file successfully moved to new location 
       $thumbName = 'thumb_image_name'; 
       $thumb = make_thumb($newFileName, $thumbName, WIDTH, HEIGHT); 
      } 
     } 
    } 
} 

HTML

<form method="post" enctype="multipart/form-data"> 
    <input name="image[]" type="file" class="image-upload" /> 
    <input name="image[]" type="file" class="image-upload" /> 
    <input name="image[]" type="file" class="image-upload" /> 
    <input name="image[]" type="file" class="image-upload" /> 
    <input name="image[]" type="file" class="image-upload" /> 

    <!-- You need to add more, including a submit button --> 
</form> 

注意輸入元素的名稱。最後的[]導致PHP創建一個數組並將這些項添加到數組中。

Answer 2

如果您不爲此付出代價，您可以查看PHP File Uploader，這是一款非常漂亮而實用的工具，我已經用於兩個站點。
不是那麼便宜，但絕對值得的成本。