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Resize Image

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I am using the following code to save an image

	// location to save cropped image
	$url = 'saved12223.jpg';
	// remove the base64 part
	$base64 = base64_decode(preg_replace('#^data:image/[^;]+;base64,#', '', $_POST['string']));
	// create image
	$source = imagecreatefromstring($base64);
	// save image
	imagejpeg($source, $url, 100);

But how can I resize the width and height before saving the image. I'm not sure if I should be resizing the source or the string? Please could someone point me in the right direction.


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