Reduce quality in imagepng without save the file - php

Question

I use this code in images.php to show the images :
imagepng($out);
and if i want to reduce the images quality for thumbnails i tried this code :
imagepng($out,$filename,$quality);
i want to know how to reduce image quality without saving.

Answer 1

function resize_image($file, $w, $h, $crop=false) {
list($width, $height) = getimagesize($file);
$r = $width / $height;
if ($crop) {
if ($width > $height) {
$width = ceil($width-($width*abs($r-$w/$h)));
} else {
$height = ceil($height-($height*abs($r-$w/$h)));
}
$newwidth = $w;
$newheight = $h;
} else {
if ($w/$h > $r) {
$newwidth = $h*$r;
$newheight = $h;
} else {
$newheight = $w/$r;
$newwidth = $w;
}
}
//Get file extension
$exploding = explode(".",$file);
$ext = end($exploding);
switch($ext){
case "png":
$src = imagecreatefrompng($file);
break;
case "jpeg":
case "jpg":
$src = imagecreatefromjpeg($file);
break;
case "gif":
$src = imagecreatefromgif($file);
break;
default:
$src = imagecreatefromjpeg($file);
break;
}
$dst = imagecreatetruecolor($newwidth, $newheight);
imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
return $dst;
}
$filename = "/var/www/images/mynormalimage.png";
$resizedFilename = "/var/www/images/myresizedimage.png";
// resize the image with 300x300
$imgData = resize_image($filename, 300, 300);
// save the image on the given filename
imagepng($imgData, $resizedFilename);
// or according to the original format, use another method
// imagejpeg($imgData, $resizedFilename);
// imagegif($imgData, $resizedFilename);
https://ourcodeworld.com/articles/read/197/how-to-resize-an-image-and-reduce-quality-in-php-without-imagickenter code here