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<?php echo json_encode( array( "uuid" => "123453ddsde", "cmd" => "cat /etc/config/network" ) );
based on T3XBY
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
{"uuid":"123453ddsde","cmd":"cat \/etc\/config\/network"}