php - 在 PHP 中上传多个文件

Question

我想知道是否有人可以帮助我。

使用一些优秀的在线教程，我将下面的代码放在一起，允许用户将图像文件上传到服务器文件夹，并将文件名和其他详细信息上传到 mySQL 数据库。

PHP 脚本

<?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 表单

<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>

一切正常，但我现在想扩展允许用户一次上传多个文件的功能。我已经做了相当多的研究来了解如何上传多个文件，但我对 PHP 还很陌生，有点不确定哪种方法是实现这一目标的最佳方式。

我只是想知道是否有人可以看看我放在一起的内容并提供一些指导，告诉我如何更改它以在提交表单时上传多个文件。

非常感谢

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>

注意输入元素的名称。末尾的 [] 导致 PHP 创建一个数组并将项目添加到该数组。