压缩上传的图片是否过大

Question

所以我想调整我的图片上传，这样，如果图像是在35KB压缩它，但它似乎没有工作，不要想我这样做是正确，因为它总是给我错误 “文件大小太大了！最大值是35kb，尝试使用一些更多的压缩，或找到另一个图像。”

这里是我的代码：

function article_top_image($article_id) 
{ 
    global $db, $config; 

    if (isset($_FILES['new_image']) && $_FILES['new_image']['error'] == 0) 
    { 
     if (!@fopen($_FILES['new_image']['tmp_name'], 'r')) 
     { 
      $this->error_message = "Could not find image, did you select one to upload?"; 
      return false; 
     } 

     else 
     { 
      // check the dimensions 
      list($width, $height, $type, $attr) = getimagesize($_FILES['new_image']['tmp_name']); 

      // check if its too big 
      if ($_FILES['new_image']['size'] > 35900) 
      { 
       // compress it to see if we can make it smaller 
       imagejpeg($_FILES['new_image']['tmp_name'], $_FILES['new_image']['tmp_name'], 50); 

       // check again 
       if ($_FILES['new_image']['size'] > 35900) 
       { 
        $this->error_message = 'File size too big! The max is 35kb, try to use some more compression on it, or find another image.'; 
        return false; 
       } 
      } 

      else if ($width > $config['article_image_max_width'] || $height > $config['article_image_max_height']) 
      { 
       $this->error_message = 'Too big!'; 
       return false; 
      } 

      // this will make sure it is an image file, if it cant get an image size then its not an image 
      else if (!getimagesize($_FILES['new_image']['tmp_name'])) 
      { 
       $this->error_message = 'Not an image!'; 
       return false; 
      } 
     } 

     // see if they currently have an avatar set 
     $db->sqlquery("SELECT `article_top_image` FROM `articles` WHERE `article_id` = ?", array($article_id)); 
     $image = $db->fetch(); 

     // give the image a random file name 
     $imagename = rand() . 'id' . $article_id . '.jpg'; 

     // the actual image 
     $source = $_FILES['new_image']['tmp_name']; 

     // where to upload to 
     $target = $_SERVER['DOCUMENT_ROOT'] . "/uploads/articles/topimages/" . $imagename; 

     if (move_uploaded_file($source, $target)) 
     {   
      // remove old avatar 
      if ($image['article_top_image'] == 1) 
      { 
       unlink($_SERVER['DOCUMENT_ROOT'] . '/uploads/articles/topimages/' . $image['article_top_image_filename']); 
      } 

      $db->sqlquery("UPDATE `articles` SET `article_top_image` = 1, `article_top_image_filename` = ? WHERE `article_id` = ?", array($imagename, $article_id)); 
      return true; 
     } 

     else 
     { 
      $this->error_message = 'Could not upload file!'; 
      return false; 
     } 

     return true; 
    } 

} 

Answer 1

你要重用 filesize

。可能需要先致电clearstatcache。

filesize($_FILES['new_image']['tmp_name']) 

Answer 2

我也在努力压缩大图像。我正在使用下面的代码。

function image_quality() 
{ 
    $name = ''; $type = ''; $size = ''; $error = ''; 
    function compress_image($source_url, $destination_url, $quality) 
    { 
     $info = getimagesize($source_url); 

      if ($info['mime'] == 'image/jpeg') 
        $image = imagecreatefromjpeg($source_url); 

      elseif ($info['mime'] == 'image/gif') 
        $image = imagecreatefromgif($source_url); 

      elseif ($info['mime'] == 'image/png') 
        $image = imagecreatefrompng($source_url); 

      imagejpeg($image, $destination_url, $quality); 
     return $destination_url; 
    } 

    $dir = 'images_high'; 
    $files = scandir($dir); 
    foreach($files as $image) 
    { 
     $size=filesize("images_high/$image"); 
     if ($size <=50000) 
       rename("images_high/$image","user_images/$image"); 

     $url = "user_images/$image"; 
     $filename = compress_image("images_high/$image", $url, 20); 
     $buffer = file_get_contents($url); 

     unlink("images_high/$image"); 
    } 
} 

我希望它会帮助你。