在Drupal中使用imagecopyresampled调整上传图像的大小

Question

我正在尝试调整通过表单上传到Drupal的图像大小。我有它的代码是：

//Image resizing 
//Get file and if it's not the default one - resize it. 
$img = file_load($form_state['values']['event_image']); 
if($img->fid != 1) { 
    //Get the image size and calculate ratio 
    list($width, $height) = getimagesize($img->uri); 
    if($width/$height > 1) { 
    $new_width = 60; 
    $new_height = $height/($width/60); 
    } else if($width/$height < 1) { 
    $new_height = 60; 
    $new_width = $width/($height/60); 
    } else { 
    $new_width = 60; 
    $new_height = 60; 
    } 
    //Create image 
    $image_p = imagecreatetruecolor($new_width, $new_height); 
    $ext = strtolower(pathinfo($img->uri, PATHINFO_EXTENSION)); 
    if($ext == 'jpeg' || $ext == 'jpg') { 
    $image = imagecreatefromjpeg($img->uri); 
    } else { 
    $image = imagecreatefrompng($img->uri); 
    } 
    //Resize image 
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); 
    //Save image as jpeg 
    imagejpeg($image_p, file_create_url($img->uri), 80); 
    //Clean up 
    imagedestroy($image_p); 
    //Store the image permanently. 
    $img->status = FILE_STATUS_PERMANENT; 
} 
file_save($img); 

所以我想要做到的，是保存新文件（更小的尺寸）在旧的一个得到了上传。

我得到的问题是PHP抛出上imagejpeg($image_p, file_create_url($img->uri), 80);警告说：

Warning: imagejpeg() [function.imagejpeg]: Unable to open 'http://localhost:8888/drupal/sites/default/files/pictures/myimage.png' for writing: No such file or directory in event_creation_form_submit()

正因为如此，图像不调整。有谁知道我做错了什么？

谢谢，

Answer 1

正如克莱夫指出的 - 修复是使用image_scale。这里是工作代码的摘录：

//Image resizing 
//Get file and if it's not the default one - resize it. 
$img = file_load($form_state['values']['event_image']); 
if($img->fid != 1) { 
    //Get the image size and calculate ratio 
    $newImage = image_load($img->uri); 
    list($width, $height) = getimagesize($img->uri); 
    if($width/$height >= 1) { 
    image_scale($newImage, 60); 
    } else { 
    image_scale($newImage, null, 60); 
    } 
    //Save image 
    image_save($newImage); 
    $img->status = FILE_STATUS_PERMANENT; 
    }