5a739853
 patrick.he
commit
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<?php
//please note that request will fail if you upload a file larger
//than what is supported by your PHP or Webserver settings
sleep(1);//to simulate some delay for local host
//is this an ajax request or sent via iframe(IE9 and below)?
$ajax = isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH']==='XMLHttpRequest';
//our operation result including `status` and `message` which will be sent to browser
$result = array();
$file = $_FILES['avatar'];
if( is_string($file['name']) ) {
//single file upload, file['name'], $file['type'] will be a string
$result[] = validateAndSave($file);
}
else if( is_array($file['name']) ) {
//multiple files uploaded
$file_count = count($file['name']);
//in PHP if you upload multiple files with `avatar[]` name, $file['name'], $file['type'], etc will be an array
for($i = 0; $i < $file_count; $i++) {
$file_info = array(
'name' => $file['name'][$i],
'type' => $file['type'][$i],
'size' => $file['size'][$i],
'tmp_name' => $file['tmp_name'][$i],
'error' => $file['error'][$i]
);
$result[] = validateAndSave($file_info);
}
}
$result = json_encode($result);
if($ajax) {
//if request was ajax(modern browser), just echo it back
echo $result;
}
else {
//if request was from an older browser not supporting ajax upload
//then we have used an iframe instead and the response is sent back to the iframe as a script
echo '<script language="javascript" type="text/javascript">';
echo 'window.top.window.jQuery("#'.$_POST['temporary-iframe-id'].'").data("deferrer").resolve('.$result.');';
echo '</script>';
}
function validateAndSave($file) {
$result = array();
if(!preg_match('/^image\//' , $file['type'])
//if file type is not an image
|| !preg_match('/\.(jpe?g|gif|png)$/' , $file['name'])
//or extension is not valid
|| getimagesize($file['tmp_name']) === FALSE
//or file info such as its size can't be determined, so probably an invalid image file
)
{
//then there is an error
$result['status'] = 'ERR';
$result['message'] = 'Invalid file format!';
}
else if($file['size'] > 110000) {
//if size is larger than what we expect
$result['status'] = 'ERR';
$result['message'] = 'Please choose a smaller file!';
}
else if($file['error'] != 0 || !is_uploaded_file($file['tmp_name'])) {
//if there is an unknown error or temporary uploaded file is not what we thought it was
$result['status'] = 'ERR';
$result['message'] = 'Unspecified error!';
}
else {
//save file inside current directory using a safer version of its name
$save_path = preg_replace('/[^\w\.\- ]/', '', $file['name']);
//thumbnail name is like filename-thumb.jpg
$thumb_path = preg_replace('/\.(.+)$/' , '', $save_path).'-thumb.jpg';
if(
//if we were not able to move the uploaded file from its temporary location to our desired path
!move_uploaded_file($file['tmp_name'] , $save_path)
OR
//or unable to resize image to our desired size
!resize($save_path, $thumb_path, 150)
)
{
$result['status'] = 'ERR';
$result['message'] = 'Unable to save file!';
}
else {
//everything seems OK
$result['status'] = 'OK';
$result['message'] = 'Avatar changed successfully!';
//include new thumbnails `url` in our result and send to browser
$result['url'] = 'http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['SCRIPT_NAME']).'/'.$thumb_path;
}
}
return $result;
}
function resize($in_file, $out_file, $new_width, $new_height=FALSE)
{
$image = null;
$extension = strtolower(preg_replace('/^.*\./', '', $in_file));
switch($extension)
{
case 'jpg':
case 'jpeg':
$image = imagecreatefromjpeg($in_file);
break;
case 'png':
$image = imagecreatefrompng($in_file);
break;
case 'gif':
$image = imagecreatefromgif($in_file);
break;
}
if(!$image || !is_resource($image)) return false;
$width = imagesx($image);
$height = imagesy($image);
if($new_height === FALSE)
{
$new_height = (int)(($height * $new_width) / $width);
}
$new_image = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($new_image, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
$ret = imagejpeg($new_image, $out_file, 80);
imagedestroy($new_image);
imagedestroy($image);
return $ret;
}
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