PHP reduce file size of image - php

Question

My application allows users to upload bunch of images which are later sent as an email attachment. The problem shows up if file size of images that are being sent is bigger than email accept.
What I want to do is to reduce file size of image until it is lower then 5MB and this is how I tried to do it:
/*..some code...*/
$img_quality = 75;
while (filesize($path) >= 5242880) {
$img_string = file_get_contents($path);
$img = imagecreatefromstring($img_string);
$path = $this->getFilePath($file, $file_section, $entity_id);
imagejpeg($img, $path, $img_quality);
$img_quality--;
}
/*..some code...*/
//Functions I am calling
public function getFilePath($upload, $section, $id = null) {
$path = base_path('../upload').$this->downloadOverwrite($upload, $section, $id);
if(!$upload) {
return $path;
}
if(!file_exists($path)) {
return null;
}
$tmppath = #tempnam("tmp", "myapp");
file_put_contents($tmppath, file_get_contents($path));
return $tmppath;
}
public function downloadOverwrite($upload, $section, $id = null, $config = []) {
$section = !empty($upload['entity']) ? $upload['entity'] : $section;
$id = !empty($upload['entity_id']) ? $upload['entity_id'] : $id;
$path = empty($id) ? "/$section" : "/$section/$id";
if(!empty($upload)) $path .= "/{$upload['fs_name']}";
return $path;
}
This code actually works, but if image file size is too big, it takes too long before image is compressed to desired value. Is there any better solution to do this?

Answer 1

actually yes there is a package which is really popular for manipulating images in php which has good integration with laravel :
http://image.intervention.io/getting_started/installation
so with this package you do as below :
$ php composer.phar require intervention/image
and after adding aliases if laravel < 5.5 you publish vendor files :
$ php artisan vendor:publish --provider="Intervention\Image\ImageServiceProviderLaravelRecent"
then you can replace image handling to this :
// create instance
$img = Image::make('public/foo.jpg');
// resize image to fixed size
$img->resize(300, 200);
to resize or do any thing like prevent upsizing like :
// prevent possible upsizing
$img->resize(null, 400, function ($constraint) {
$constraint->aspectRatio();
$constraint->upsize();
});
or any thing you would like to do according to documentation .
hope this helps

Answer 2

In case someone has similiar problem, here is the loop that I used in the end and that worked pretty well for me. May not be the best solution out there, but it's fair enough:
$image_width = getimagesize($path)[0];
while (filesize($path) >= 5242880) {
$image_width -= 50;
$img_string = file_get_contents($path);
$img = imagecreatefromstring($img_string);
$path = $this->getFilePath($file, $file_section, $entity_id);
$img = imagescale($img, $image_width);
imagejpeg($img, $path);
}
I am lowering the width of the image, while height is being lowered automatically respecting the aspect ratio. This results in pretty fast file size drop, while keeping the quality of image at approximately the same level as it was before scaling.