<!DOCTYPE html> <html> <head> <title></title> </head> <body> <pre> <?= json_encode($_POST, JSON_PRETTY_PRINT); ?> </pre> <form method="POST"> <input type="text" name="group[1][foo]" value="A"/> <input type="text" name="group[2][foo]" value="B"/> <input type="submit" value="Submit"/> </form> </body> </html>
