php - Group week names based on start and end time -

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i have array this

array(        [mon] => array     (         [start] => 09         [end] => 18         [hours] => 9     )  [tue] => array     (         [start] => 09         [end] => 18         [hours] => 9     )  [wed] => array     (         [start] => 09         [end] => 18         [hours] => 9     )  [thu] => array     (         [start] => 09         [end] => 18         [hours] => 9     )  [fri] => array     (         [start] => 00         [end] => 21         [hours] => 21     )  [sat] =>  [sun] =>  );

now task able display in simple format like

mon-thu    fri 09 - 18    00-21

so how can transform above array simple array display required format @ client

i tried following code, giving dates group by, 

  $workhours = $bhr->workinghours; $days = array_keys($workhours); $workhoursinfo = array_values($workhours); $result = array();  for($i=0;$i<count($workhoursinfo);$i++){     $info1 = $workhoursinfo[$i];     if(empty($info1))            continue;     for($j=1;$j<count($workhoursinfo);$j++) {         $info2 = $workhoursinfo[$j];         if(empty($info2))            continue;         if($info1['start'] === $info2['start'] && $info1['end'] === $info2['end']) {             if(!in_array($days[$i],$result)) {                 $result[] = $days[$i];             }         }     } }

here function can you. i've added comments did.

$workhours = array(     'mon' => array('start' => '09', 'end' => '18', 'hours' => '9'),     'tue' => array('start' => '09', 'end' => '18', 'hours' => '9'),     'wed' => array('start' => '09', 'end' => '18', 'hours' => '9'),     'thu' => array('start' => '09', 'end' => '18', 'hours' => '9'),     'fri' => array('start' => '00', 'end' => '21', 'hours' => '21'),     'sat' => array(),     'sun' => array(), );   function format_workhours($workhours){     $days = array_keys($workhours);      $temp = array();     // group start , end hours     foreach($workhours $day => $hours){         if(isset($hours['start'])){             $temp[$hours['start'] . '-' . $hours['end']][] = $day;         }     }      // echo , or -      foreach($temp $i => $work){         $first = reset($work);         // 1 day print         if (count($work) === 1){             echo $first . ': ' . $i . '<br>';             continue;         }         $pos = array_search($first,$days);         $array = array_slice($days,$pos,count($temp[$i]));         // days follow on each other use dash         if($temp[$i] === $array){             $last = end($work);             echo $first . '-' . $last . ':' . $i . '<br>';         }else{ // print days comma             $workdays = implode(',',$work);             echo $workdays . ':' . $i . '<br>';         }     } }  format_workhours($workhours);

output:

mon-thu:09-18
fri: 00-21


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