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<?php $json_arr='{"#D1 1":"750x225","#D1 2":"735x450","#D1 3":"750x216","#D2 1":"750x450","#D2 2":"735x450"}'; $encode=json_encode($json_arr); print_r($encode);
Output for git.master, git.master_jit, rfc.property-hooks
"{\"#D1 1\":\"750x225\",\"#D1 2\":\"735x450\",\"#D1 3\":\"750x216\",\"#D2 1\":\"750x450\",\"#D2 2\":\"735x450\"}"

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