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<?php $filtered_decoded[0]['data'] = array( array( 'position' => 2, 'date' => '2013-01-02' ), array( 'position' => 3, 'date' => '2013-01-03' ) ); $filtered_decoded[1]['data'] = array( array( 'position' => 8, 'date' => '2013-01-02' ), array( 'position' => 5, 'date' => '2013-01-03' ) ); $converteddatesarray = array(); print_r($filtered_decoded); foreach ($filtered_decoded['data'] as $key => $list) { $converteddatesarray[] = '['.strtotime($list['date']).'000,'.$list['position'].']'; } $test .= '{"name":"'.$name.'","data":['. implode(",",$converteddatesarray).']},'; echo '['.rtrim($test,",").']';

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