PHP Image Processing with GD Image Cropping and Resizing
Example
If you have an image and want to create a new image, with new dimensions, you can use imagecopyresampled function:
first create a new image with desired dimensions:
// new image
$dst_img = imagecreatetruecolor($width, $height);
and store the original image into a variable. To do so, you may use one of the createimagefrom* functions where * stands for:
- jpeg
- gif
- png
- string
For example:
//original image
$src_img=imagecreatefromstring(file_get_contents($original_image_path));
Now, copy all (or part of) original image (src_img) into the new image (dst_img) by imagecopyresampled:
imagecopyresampled($dst_img, $src_img,
$dst_x ,$dst_y, $src_x, $src_y,
$dst_width, $dst_height, $src_width, $src_height);
To set src_* and dst_* dimensions, use the below image:
Now, if you want to copy entire of source (initial) image, into entire of destination area (no cropping):
$src_x = $src_y = $dst_x = $dst_y = 0;
$dst_width = $width;// width of new image
$dst_height = $height; //height of new image
$src_width = imagesx($src_img); //width of initial image
$src_height = imagesy($src_img); //height of initial image
