在PHP中转换和保存上传的图像？

我有以下代码

$current_full_path = realpath(dirname(__FILE__) . '/..');
$user_profile_picture_filename = $current_full_path . "/profile_pictures/" . $userid . ".jpg";

$user_profile_picture_submit = $_POST['user_profile_picture_submit'];

if (isset ($user_profile_picture_submit)) {

    $user_profile_image = $_FILES['user_profile_image']['name'];
    $temp_profile_picture = $_FILES['user_profile_image']['tmp_name'];

    $profile_picture_extension_array = explode( ".", $user_profile_image); 
    $profile_picture_extension_case_insensitive = end($profile_picture_extension_array);
    $profile_picture_extension = strtolower($profile_picture_extension_case_insensitive);

    if ($profile_picture_extension == "png") {

        $temp_profile_picture_converted = imagecreatefrompng($temp_profile_picture);

    } elseif ($profile_picture_extension == "bmp") {

        $temp_profile_picture_converted = imagecreatefromwbmp($temp_profile_picture);

    } elseif ($profile_picture_extension == "gif") {

        $temp_profile_picture_converted = imagecreatefromgif($temp_profile_picture);

    } elseif (($profile_picture_extension == "jpg") || ($profile_picture_extension == "jpeg")) {

        $temp_profile_picture_converted = imagecreatefromjpeg($temp_profile_picture);

    } 

    imagejpeg($temp_profile_picture_converted, $user_profile_picture_filename, '75');
    imagedestroy($temp_profile_picture_converted);


}

---

我要做的是获取上传的图片，获取扩展名，检查它有哪个扩展名，然后根据扩展名，用PHP将其转换为jpeg，然后将其保存为“/bar/”目录中的userid.jpg。但是，没有保存任何内容。

我得到了使用php转换和保存图像的解决方案。您可以按照此操作
PHP<5.3

$fullpath = dirname(__FILE__);

PHP>=5.3

$fullpath = __DIR__;

---

查看一下

这对于获取文件类型来说更为健壮

获得原始图像后，将其转换并保存

获取上传：

if( is_uploaded_file($_FILES['image1']['tmp_name']) || !($_FILES['image1']['error'] !== UPLOAD_ERR_OK)){
  $save = false;

  switch(strtolower($_FILES['image1']['type'])){
  case 'image/jpeg':
    $image = @imagecreatefromjpeg($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  case 'image/png':
    $image = @imagecreatefrompng($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  case 'image/gif':
    $image = @imagecreatefromgif($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  default:
    $img = getimagesize($_FILES['image1']['tmp_name']);
    switch(strtolower($img['mime'])){
    case 'image/jpeg':
      $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    case 'image/png':
      $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    case 'image/gif':
      $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    default:
      $filename = $_FILES['image1']['name'];
      $ext = substr($filename,-3);
      switch(strtolower($ext)){
      case 'jpg':
        $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      case 'gif':
        $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      case 'png':
        $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      default:
        $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
        $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
        $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      }
    }
  }
}

 if ($save === true){
   ob_start();
   imagejpeg($image, NULL, 70);
   $jpg = ob_get_clean();

查找类型：

if( is_uploaded_file($_FILES['image1']['tmp_name']) || !($_FILES['image1']['error'] !== UPLOAD_ERR_OK)){
  $save = false;

  switch(strtolower($_FILES['image1']['type'])){
  case 'image/jpeg':
    $image = @imagecreatefromjpeg($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  case 'image/png':
    $image = @imagecreatefrompng($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  case 'image/gif':
    $image = @imagecreatefromgif($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  default:
    $img = getimagesize($_FILES['image1']['tmp_name']);
    switch(strtolower($img['mime'])){
    case 'image/jpeg':
      $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    case 'image/png':
      $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    case 'image/gif':
      $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    default:
      $filename = $_FILES['image1']['name'];
      $ext = substr($filename,-3);
      switch(strtolower($ext)){
      case 'jpg':
        $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      case 'gif':
        $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      case 'png':
        $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      default:
        $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
        $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
        $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      }
    }
  }
}

 if ($save === true){
   ob_start();
   imagejpeg($image, NULL, 70);
   $jpg = ob_get_clean();

将图像转换为jpg:

if( is_uploaded_file($_FILES['image1']['tmp_name']) || !($_FILES['image1']['error'] !== UPLOAD_ERR_OK)){
  $save = false;

  switch(strtolower($_FILES['image1']['type'])){
  case 'image/jpeg':
    $image = @imagecreatefromjpeg($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  case 'image/png':
    $image = @imagecreatefrompng($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  case 'image/gif':
    $image = @imagecreatefromgif($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  default:
    $img = getimagesize($_FILES['image1']['tmp_name']);
    switch(strtolower($img['mime'])){
    case 'image/jpeg':
      $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    case 'image/png':
      $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    case 'image/gif':
      $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    default:
      $filename = $_FILES['image1']['name'];
      $ext = substr($filename,-3);
      switch(strtolower($ext)){
      case 'jpg':
        $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      case 'gif':
        $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      case 'png':
        $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      default:
        $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
        $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
        $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      }
    }
  }
}

 if ($save === true){
   ob_start();
   imagejpeg($image, NULL, 70);
   $jpg = ob_get_clean();

保存：

if( is_uploaded_file($_FILES['image1']['tmp_name']) || !($_FILES['image1']['error'] !== UPLOAD_ERR_OK)){
  $save = false;

  switch(strtolower($_FILES['image1']['type'])){
  case 'image/jpeg':
    $image = @imagecreatefromjpeg($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  case 'image/png':
    $image = @imagecreatefrompng($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  case 'image/gif':
    $image = @imagecreatefromgif($_FILES['image1']['tmp_name']);
    if ($image !== false){$save = true;break;}
  default:
    $img = getimagesize($_FILES['image1']['tmp_name']);
    switch(strtolower($img['mime'])){
    case 'image/jpeg':
      $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    case 'image/png':
      $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    case 'image/gif':
      $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
      if ($image !== false){$save = true;break;}
    default:
      $filename = $_FILES['image1']['name'];
      $ext = substr($filename,-3);
      switch(strtolower($ext)){
      case 'jpg':
        $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      case 'gif':
        $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      case 'png':
        $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      default:
        $image = imagecreatefromjpeg($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
        $image = imagecreatefrompng($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
        $image = imagecreatefromgif($_FILES['image1']['tmp_name']);
        if ($image !== false){$save = true;break;}
      }
    }
  }
}

 if ($save === true){
   ob_start();
   imagejpeg($image, NULL, 70);
   $jpg = ob_get_clean();

其中，

$user

是用户ID

   $fp = fopen("/home/user/public_html/bar/$user.jpg",'w');
   fwrite($fp,$jpg);
   fclose($fp);
 }

---

}

我认为您需要给出变量$user\u profile\u picture\u filename的完整路径含义？这不是一条完整的路径吗？在定义$userid的情况下，该变量的值为“”通过下面的答案设置$user\u profile\u picture\u文件名路径。我很难理解这为什么适用。如果我理解正确，这些预定义常量只是指向正在运行的当前文件的目录。您需要使用这些完整路径保存映像。您有写入映像的权限吗？我为常规文件编写了一个上载程序，在同一台服务器上似乎可以正常工作，所以是的。这没关系，但是你需要有在那个特定文件夹中写入的权限，检查profile\u pictures文件夹的权限。