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<?php
$upload_dir = "images";  //implement this function yourself
$img = $_POST['imgBase64'];
$img = str_replace('data:image/png;base64,', '', $img);
$img = str_replace(' ', '+', $img);
$data = base64_decode($img);
$file = $upload_dir."/image_name.png";
$success = file_put_contents($file, $data);
?>