PHP多图片文件上传存储到文件夹和数据库

Question

我正在构建一个网站，该网站将向夜间狂欢者展示大城市夜总会场所和事件的列表。我正在尝试构建一个后端页面，管理员可以在其中添加俱乐部并输入信息，例如机构名称、位置、相对价格等，当然还有俱乐部的一些图片。

每个俱乐部都必须至少有一张图片，即主图片。可以有额外的 5，但这些是可选的，即。数据库字段可以为空。

我有一个看起来像这样的表单:

Establishment Main Photo
TextField: name = "establishment_image"

Establishment Photo 1
TextField: name = "establishment_image"

Establishment Photo 2
TextField: name = "establishment_image"

Establishment Photo 3
TextField: name = "establishment_image"

Establishment Photo 4
TextField: name = "establishment_image"

Establishment Photo 5
TextField: name = "establishment_image"

它有点像雅虎邮件的附加文件形式。如您所见，文本字段目前具有相同的文本字段名称。

我需要知道我需要对我的提交表单进行哪些更改才能:例如；

放一张主图，其他文本框留空，放一张主图，图 1 和图 2，其他文本字段留空，放置一张主要图片，图片 1、2 和 3，并将其他文本字段留空等。

我的 establishment_submit.php 看起来像这样:

<?php require_once('../Connections/connections.php'); ?>
<?php //maintain the session
if (!isset($_SESSION))
{
  session_start();
}
?>
<?php 
//retrieve data from Query String
$establishment_name= $_POST['establishment_name'];  
$short_description= $_POST['short_description'];        
$long_description= $_POST['long_description'];      
$location= $_POST['location'];          
$url_link= $_POST['url_link'];  
$establishment_address= $_POST['establishment_address'];        
$establishment_pricing= $_POST['establishment_pricing'];
$establishment_telephone= $_POST['establishment_telephone'];        
$establishment_contact= $_POST['establishment_contact'];
$establishment_email= $_POST['establishment_email'];            
$establishment_image = $_FILES['establishment_image']['name']; 

//escape User Input to help prevent SQL Injection
$establishment_name= mysql_real_escape_string($establishment_name);     
$short_description= mysql_real_escape_string($short_description);       
$long_description = mysql_real_escape_string($long_description);        
$location= mysql_real_escape_string($location);             
$url_link= mysql_real_escape_string($url_link);
$establishment_address= mysql_real_escape_string($establishment_address);
$establishment_pricing= mysql_real_escape_string($establishment_pricing);
$establishment_telephone= mysql_real_escape_string($establishment_telephone);
$establishment_contact= mysql_real_escape_string($establishment_contact);
$establishment_email= mysql_real_escape_string($establishment_email);
$establishment_image= mysql_real_escape_string($establishment_image);

//redirect when successful
$establishmentAddSuccess = "establishment_add_success.php";
?>
<?php
//define a maximum size for the uploaded images
define ("MAX_SIZE","10000");
// note that these dimensions are considered the maximum and are not fixed
// because we have to keep the image ratio intact
//define a maximum size for the uploaded images
define ("LARGE_WIDTH","500");
define ("LARGE_HEIGHT","390");
define ("WIDTH","100"); //set here the width you want your thumbnail to be
define ("HEIGHT","100"); //set here the height you want your thumbnail to be.
// this is the function that will create the appropriately sized images from the upload 
// the resize will be done considering the width and height defined, but without deforming the image

function make_largeimage($img_name,$filename,$new_large_w,$new_large_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);
    if(!strcmp("gif",$ext))
    $src_img=imagecreatefromgif($img_name);
    //gets the dimensions of the image
    $old_x=imageSX($src_img);
    $old_y=imageSY($src_img);
    // next we will calculate the new dimensions for the large image
    // the next steps will be taken:
    // 1. calculate the ratio by dividing the old dimensions 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 dimensions will be from the fixed ones
    $ratio1_large=$old_x/$new_large_w;
    $ratio2_large=$old_y/$new_large_h;
    if($ratio1_large>$ratio2_large) 
    {
        $large_w=$new_large_w;
        $large_h=$old_y/$ratio1_large;
    }else
    {
        $large_h=$new_large_h;
        $large_w=$old_x/$ratio2_large;
    }
    // we create a new image with the new dimensions
    $dst_large_img=ImageCreateTrueColor($large_w,$large_h);
    // resize the big image to the newly created one
    imagecopyresampled($dst_large_img,$src_img,0,0,0,0,$large_w,$large_h,$old_x,$old_y);
    // output the created image to the file. Now we will have the image into the file named by $filename
    if(!strcmp("png",$ext))
        imagepng($dst_large_img,$filename);
    else
        imagejpeg($dst_large_img,$filename);
    if (!strcmp("gif",$ext))
    imagegif($$dst_large_img,$filename);
    //destroys source and destination images.
    imagedestroy($dst_large_img);
    imagedestroy($src_img);
}

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);
    if(!strcmp("gif",$ext))
    $src_img=imagecreatefromgif($img_name);
    //gets the dimmensions of the image
    $old_x=imageSX($src_img);
    $old_y=imageSY($src_img);
    // next we will calculate the new dimensions for the thumbnail image
    // the next steps will be taken:
    // 1. calculate the ratio by dividing the old dimensions 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 dimensions 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 dimensions
    $dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
    // resize the big image to the newly created one
    imagecopyresampled($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);
    if (!strcmp("gif",$ext))
    imagegif($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;
}
// 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.
$errors=0;
// if it is not empty
for($i=0;$i<count($_FILES['establishment_image']["name"]);$i++)
{
// get the original name of the file from the clients machine
$filenames = stripslashes($_FILES['establishment_image']['name'][$i]);

// get the extension of the file in a lower case format
$extensions = getExtension($filenames);
$extensions = strtolower($extensions);
// 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 (($extensions != "jpg") && ($extensions != "jpeg") && ($extensions != "png") && ($extensions != "gif"))
{
$warning = ("File extension of an image(s) not allowed");
header("location:establishment_add.php?warning=$warning");  
$errors=1;
exit();
}
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['establishment_image']['tmp_name'][$i]);
$sizekb=filesize($_FILES['establishment_image']['tmp_name'][$i]);

//compare the size with the maxim size we defined and print error if bigger
if ($sizekb > MAX_SIZE*1024)
{
$warning = ("Images have exceeded the size limit of 10MB");
header("location:establishment_add.php?warning=$warning");  
$errors=1;
exit();
}
$rand= rand(0, 100000);
//we will give an unique name, for example a random number
$image_name=$rand.'.'.$extension;
//the new name will be containing the full path where the image will be stored (images folder)
$consname="C:/wamp/www/NNL/Administrator/Establishment_Images/".$image_name; //change the image/ section to where you would like the original image to be stored
$consname2="C:/wamp/www/NNL/Administrator/Establishment_Images/Thumbs/".$image_name;
//change the image/thumb to where you would like to store the new created thumbnail of the image
$copied = copy($_FILES['establishment_image']['tmp_name'][$i], $consname);
$copied = copy($_FILES['establishment_image']['tmp_name'][$i], $consname2);
//localhost calling of images
$img_large="../Establishment_Images/".$image_name; //change the image/ section to where you would like the original image to be stored
$img_thumb="../Establishment_Images/Thumbs/".$image_name;
//we verify if the image has been uploaded, and print error instead
if (!$copied) {
$warning = ("Unable to upload image file");
header("location:establishment_add.php?warning=$warning");  
$errors=1;
exit();
}else{
// the new large image will be placed in Images/ folder
$imagelarge_name=$consname ;
// 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
$imagelarge=make_largeimage($consname,$imagelarge_name,LARGE_WIDTH,LARGE_HEIGHT);
// the new thumbnail image will be placed in Images/Thumbs/ folder
$thumb_name=$consname2 ;
// 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
$thumb=make_thumb($consname,$thumb_name,WIDTH,HEIGHT);
}
}
}
?>
<?php
//If no errors registered, redirect page
if(isset($_POST['Submit']) && !$errors) 
{
//insert into database
$query2 = "INSERT INTO establishment(establishment_name, 
                            establishment_short_description, 
                            establishment_long_description, 
                            establishment_address,
                            establishment_telephone, 
                            establishment_contact, 
                            establishment_email,  
                            location_id, 
                            establishment_pricing,                          
                            establishment_url_link,
                            establishment_mainphoto_url,
                            establishment_thumb_url) 
                            VALUES  
                            ('$establishment_name',
                            '$short_description',
                            '$long_description',
                            '$establishment_address',
                            '$establishment_telephone',
                            '$establishment_contact',
                            '$establishment_email',
                            '$location',
                            '$establishment_pricing',
                            '$url_link',                            
                            '$img_large[0]',
                            '$img_thumb[0]')";                          
//Execute query
$qry_result2 = mysql_query($query2) or die(mysql_error());

header("Location: " . $establishmentAddSuccess);
}
else
{
    $establishment_msg = ("Unable to add establishment");
    header("location:establishment_add.php?establishment_msg=$establishment_msg");  
    exit(); 
}       
?>

这对于单张图片上传效果很好，但现在不起作用。我知道我需要从行中进行更改；

for($i=0;$i<count($_FILES['establishment_image']["name"]);$i++)
{

如何使此表单能够上传多张图片。我将不胜感激任何帮助。

Answer 1

您可以像在常规表单字段中一样使用 PHP 的数组表示法:

Pic 1:  <input type="file" name="establishment_image[]" />
Pic 2:  <input type="file" name="establishment_image[]" />

但是，PHP 中的文件处理方式与服务器端的处理方式略有不同:

$_FILES = array(
    'establishment_image' => array(
          'name' => array(
              0 => 'name of Pic 1 file',
              1 => 'name of Pic 2 file'
          ),
          'error' => array(
              0 => error code for pic1 upload,
              1 => error code for pic2 upload
      etc...
);

不过，它很容易处理:

foreach(array_keys($_FILES['establishment_image']['name']) as $idx) {
     .... 
}

另一种选择是为每个文件输入一个唯一的名称并使用该服务器端。如果您在每个中硬编码一个数字“子键”:

<input type="file" name="establishment_image_1" />
<input type="file" name="establishment_image_2" />

然后你可以简单地做

for ($i = 1; $i <= 5; $i++) {
     echo "Name of file is ", $_FILES["establishment_image_$i"]['name'];
     ... 
}