PHP 서버에 Base64 PNG 이미지를 효율적으로 저장하는 방법은 무엇입니까?

<?php

// Extract and decode the base64 data
$data = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAABE...';
list($type, $data) = explode(';', $data);
list(, $data) = explode(',', $data);
$data = base64_decode($data);

// Save the image to the server
file_put_contents('/tmp/image.png', $data);

?>

$data = base64_decode(preg_replace('#^data:image/\w+;base64,#i', '', $data));

if (preg_match('/^data:image\/(\w+);base64,/', $data, $type)) {
    $data = substr($data, strpos($data, ',') + 1);
    $type = strtolower($type[1]); // jpg, png, gif

    if (!in_array($type, ['jpg', 'jpeg', 'gif', 'png'])) {
        throw new \Exception('invalid image type');
    }
    $data = str_replace(' ', '+', $data);
    $data = base64_decode($data);

    if ($data === false) {
        throw new \Exception('base64_decode failed');
    }
} else {
    throw new \Exception('did not match data URI with image data');
}

file_put_contents("img.{$type}", $data);