Gd Library Flip image and saving it - php

Question

I am using PHP GD library to flip an image and then save that flipped image. However I am able to flip image successfully but I don’t know how to save it with another name in a folder. My code is
$filename = '324234234234.jpg';
header('Content-type: image/jpeg');
$im = imagecreatefromjpeg($filename);
imageflip($im, IMG_FLIP_VERTICAL);
imagejpeg($im);

Answer 1

You need to pass a second parameter to imagejpeg($im) call with the path to the file you want to store.
imagejpeg($im, 'path/to/new/file.jpg');
http://php.net/manual/en/function.imagejpeg.php

Answer 2

Look at the documentation for imagejpeg where it explains the second parameter relates to $filename:
bool imagejpeg ( resource $image [, string $filename [, int $quality ]] )
The path to save the file to. If not set or NULL, the raw image stream will be outputted directly.
So just add the new filename as a second parameter like this; assuming the name of the new name is new_filename.jpg. Also comment out or completely remove the header line so you are not outputting the image to the browser, but rather saving it to a file so the header isn’t needed:
$filename = '324234234234.jpg';
// header('Content-type: image/jpeg');
$im = imagecreatefromjpeg($filename);
imageflip($im, IMG_FLIP_VERTICAL);
imagejpeg($im, 'new_filename.jpg');
Also note that while imageflip is nice to use it is only available in PHP 5.5 & higher; it won’t be available in PHP 5.4 or lower:
(PHP 5 >= 5.5.0)
image flip — Flips an image using a given mode
So if you want to use it in PHP 5.4 or lower, you need to create the logic to flip it on your own in the code or use a function like this. It only flips horizontally so you would have to adjust it to flip vertically, but posting here so you have something to explore & work with if needed:
/**
* Flip (mirror) an image left to right.
*
* #param image resource
* #param x int
* #param y int
* #param width int
* #param height int
* #return bool
* #require PHP 3.0.7 (function_exists), GD1
*/
function imageflip(&$image, $x = 0, $y = 0, $width = null, $height = null)
{
if ($width < 1) $width = imagesx($image);
if ($height < 1) $height = imagesy($image);
// Truecolor provides better results, if possible.
if (function_exists('imageistruecolor') && imageistruecolor($image))
{
$tmp = imagecreatetruecolor(1, $height);
}
else
{
$tmp = imagecreate(1, $height);
}
$x2 = $x + $width - 1;
for ($i = (int) floor(($width - 1) / 2); $i >= 0; $i--)
{
// Backup right stripe.
imagecopy($tmp, $image, 0, 0, $x2 - $i, $y, 1, $height);
// Copy left stripe to the right.
imagecopy($image, $image, $x2 - $i, $y, $x + $i, $y, 1, $height);
// Copy backuped right stripe to the left.
imagecopy($image, $tmp, $x + $i, $y, 0, 0, 1, $height);
}
imagedestroy($tmp);
return true;
}