如何使用 PHP 壓縮將 PNG 映像轉換為 JPG，同時保持品質並最小化檔案大小？

<code class="php">// Convert PNG image to JPG with transparency in white
$image = imagecreatefrompng($filePath);
$bg = imagecreatetruecolor(imagesx($image), imagesy($image));
imagefill($bg, 0, 0, imagecolorallocate($bg, 255, 255, 255));
imagealphablending($bg, TRUE);
imagecopy($bg, $image, 0, 0, 0, 0, imagesx($image), imagesy($image));
imagedestroy($image);

// Set compression quality (0=worst, 100=best)
$quality = 50;

// Convert to JPG and save to new file
imagejpeg($bg, $filePath . ".jpg", $quality);
imagedestroy($bg);</code>