Php continuous retention and retention count calculation

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for($i = 0;$i <= $interval;$i++) {        $res  = $model->turnround($today,$tomorrow,$flag);         $temp = array();         foreach($res as $value){        $inmatch = isset($value['inmatch']) ? json_decode($value['inmatch']) : array();            foreach($inmatch as $val) {            if(!in_array($val, $temp)) {                        array_unshift($temp,$val);              }            }        }        $i==0 ? $total = count($temp) : "";             $temp = array_fill_keys($temp, $i);         foreach($temp as $k=>$v) {        if(array_key_exists($k,$stats)) {                     $stats[$k] = $stats[$k].",".$v;        } else {        $stats[$k] = $v;        }        }        $today    = $today + 86400;             $tomorrow = $tomorrow + 86400;            }$strlen = ($interval+1)*2-1;foreach($stats as $v) {if(isset($v)) {strlen(trim($v)) == $strlen ? $num++ : $num;}}$ret['turnround']['all']   = $stats;$ret['turnround']['total'] = $total;$ret['turnround']['stats'] = count($stats);$ret['turnround']['num']   = $num; */$res = $model->turnround($today,$tomorrow,$flag);             $todayPeople = array();         foreach($res as $value){        $inmatch = isset($value['inmatch']) ? json_decode($value['inmatch']) : array();            foreach($inmatch as $val) {            if(!in_array($val, $todayPeople)) {                        array_unshift($todayPeople,$val);              }            }        }        $todayNum   = count($todayPeople);          $atToday    = $today + $interval*86400;        $atTomorrow = $tomorrow + $interval*86400;         $atRes = $model->turnround($atToday,$atTomorrow,$flag);         $atPeople = array();         foreach($atRes as $v){        $atInmatch = isset($v['inmatch']) ? json_decode($v['inmatch']) : array();            foreach($atInmatch as $val) {            if(!in_array($val, $atPeople)) {                        array_unshift($atPeople,$val);              }            }        }        $same = array_intersect($todayPeople,$atPeople);        $atNum= count($same);        $ret['turnround']['all']   = $todayPeople;   $ret['turnround']['total'] = $todayNum;      $ret['turnround']['stats'] = "";    $ret['turnround']['num']   = $atNum;      

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