Resize the image propositionally until required file size is met - php

Question

Currently have a simple function that works, but it allows user to add big images. I want to allow all image uploads, but there should be a function that resizes the image until certain file size is met (like under 200kb for example)
if($_FILES['file']['size'] != 0){
$uploadOk = 0;
//image object
$image = $_FILES['file'];
//create unique name for file
$imageRandomName = substr(md5(time()), 0, 5) . "-" . $image['name'];
//upload dir
$target_dir = "rest/user" . $_SESSION["username"] . "/events/" . $_SESSION["event_id"] . "/people/";
//make folder for user if non exists
if(!file_exists($target_dir)){
mkdir($target_dir, 0777, true);
}
//file to be upload
$target_file = $target_dir . base($imageRandomName);
//get file type
$imageFileType = pathinfo($target_file, PATHINFO_EXTENSION);
$check = getimagesize($image["tmp_name"]);
if($check !== false){
$uploadOk = 1;
} else {
$uploadOk = 0;
}
if($uploadOk == 0){
echo "noupload";
} else {
if ( move_uploaded_file($image["tmp_name"], $target_file ) ) {
//get file size on server
$filesizeonserver = filesize($target_file);
echo "file: ".$target_file." size: ".$filesizeonserver;
$times = 0;
if($filesizeonserver > 100000){
do{
$resized = resizeImage($target_file, "0.1");
$filesizeonserver = filesize($target_file);
$times++;
} while ($filesizeonserver > 100000);
echo "resized ".$times." times";
} else {
}
//mysql query
} else {
echo "Sorry, there was an error uploading your file.";
}
}
} else {
//do mysql query
}
resizeImage()
function resizeImage($file, $percent){
list($width, $height) = getimagesize($file);
$newwidth = $width-($width*$percent);
$newheight = $height-($height*$percent);
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($file);
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
$newImage = imagejpeg($thumb, $file, 100);
return $newImage;
}
Now I am getting somewhere, I think I am really close achieving it, but for some weird reason I am getting image that has dimension of 1px width, 4px height and size of 4kb. Completely black image.
In case you are thinking what image am adding to this function:
1,232,055 bytes, 1220 × 1829, 72dpi, JPEG
EDIT: Okay now I think something is wrong with the resizeImage function. Since it works only first the first time. For some reason it fails to get image and renders it black and tiny.
EDIT2: Now I am getting image resized function, there was nothing wrong with it. I noticed that function keeps resizing the image till to its bitter end. I can see it in the find how it shrinks.
EDIT3: I located the problem. Now it seems that $filesizeonserver is getting always the first value and in do...while its not updating even thou i am setting it to change.

Answer 1

$allowedFileTypes = ['image/png', 'image/gif', 'image/jpeg', 'image/jpg'];
if (in_array($_FILES['image']['type'], $allowedFileTypes)) {
$imageType = $_FILES['image']['type'];
//allow file size under 10mb
if($_FILES['file']['size'] < 10000000){
//image object
$image = $_FILES['file'];
//so there is no same name files
$imageRandomName = substr( md5( time() ), 0, 5 ) . "-" . $image['name'];
//place where image is uploaded
$target_dir = 'rest/user/' . $_SESSION['username'] . '/events/' . $_SESSION['event_id'] . '/people/';
//make folder for users
if ( !file_exists( $target_dir ) ) {
mkdir( $target_dir, 0777, true );
}
//file to be uploded
$target_file = $target_dir . basename( $imageRandomName );
//get file type
//$imageFileType = pathinfo( $target_file, PATHINFO_EXTENSION );
$check = getimagesize($image["tmp_name"]);
if ($check !== false) {
echo "File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
} else {
echo "File is not an image.";
$uploadOk = 0;
}
//check if upload is ok
if ( $uploadOk == 0 ) {
echo "Sorry cant upload";
} else {
if ( move_uploaded_file($image["tmp_name"], $target_file ) ) {
//get file size on server
$filesizeonserver = filesize($target_file);
$times = 0;
if($filesizeonserver > 300000){
do{
clearstatcache();
$resized = resizeImage($target_file, 0.05, $imageType);
$filesizeonserver = filesize($target_file);
$times++;
} while ($filesizeonserver > 300000);
echo "resized ".$times." times";
} else {
}
//sql query
} else {
echo "Sorry, there was an error uploading your file.";
}
}
} else {
//sql query
}
} else {
echo "wrongimagetype";
}
resizeImage()
function resizeImage($file, $percent, $imageType){
list($width, $height) = getimagesize($file);
$newwidth = $width-($width*$percent);
$newheight = $height-($height*$percent);
$thumb = imagecreatetruecolor($newwidth, $newheight);
switch($imageType){
case 'image/png':
$background = imagecolorallocate($thumb, 0, 0, 0);
imagecolortransparent($thumb, $background);
imagealphablending($thumb, false);
imagesavealpha($thumb, true);
$source = imagecreatefrompng($file);
break;
case 'image/gif':
$background = imagecolorallocate($thumb, 0, 0, 0);
imagecolortransparent($thumb, $background);
imagealphablending($thumb, false);
imagesavealpha($thumb, true);
$source = imagecreatefromgif($file);
break;
case 'image/jpeg':
case 'image/jpg':
$source = imagecreatefromjpeg($file);
break;
}
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
switch($imageType){
case 'image/png':
$image = imagepng($thumb, $file, 0);
break;
case 'image/gif':
$image = imagegif($file);
break;
case 'image/jpeg':
case 'image/jpg':
$image = imagejpeg($thumb, $file, 100);
break;
}
return $image;
}
OUTPUT:
File is an image - image/jpeg.resized 17 times
Disclaimer: Whole things works thou image quality suffer a bit. Need to work on that.