php - Excluding specific half hour from the list of half hours -

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i have loop gives outcome of number of half hours between given start time , end time

$start    = new datetime('09:00:00'); // add 1 second because last 1 not included in loop $end      = new datetime('16:00:01');  $interval = new dateinterval('pt30m'); $period   = new dateperiod($start, $interval, $end);  $previous = ''; foreach ($period $dt) {     $current = $dt->format("h:ia");     if (!empty($previous)) {         echo "<input name='time' type='radio' value='{$previous}|{$current}'>                {$previous}-{$current}<br/>";     }     $previous = $current; }

the outcome of above loop following

09:00am-09:30am 09:30am-10:00am 10:00am-10:30am 10:30am-11:00am 11:00am-11:30am 11:30am-12:00pm 12:00pm-12:30pm 12:30pm-01:00pm 01:00pm-01:30pm 01:30pm-02:00pm 02:00pm-02:30pm 02:30pm-03:00pm 03:00pm-03:30pm 03:30pm-04:00pm

what trying achieve exclude of time mentioned below if exist in array $existing_time looks this

    [0] => array         (             [start_time] => 2014-03-28t14:00:00+1100             [end_time] => 2014-03-28t14:30:00+1100         )      [1] => array         (             [start_time] => 2014-03-28t15:00:00+1100             [end_time] => 2014-03-28t15:30:00+1100         ) )

i need in how go doing this, appreciated

i added start times array , check see if current start time in array. if so, skip it.

<?php $start    = new datetime('09:00:00'); $end      = new datetime('16:00:01'); // add 1 second because last 1 not included in loop $interval = new dateinterval('pt30m'); $period   = new dateperiod($start, $interval, $end);  $existing_time = array(     array(         'start_time' => '2014-03-28t14:00:00+1100',         'end_time' => '2014-03-28t14:30:00+1100'     ),     array(         'start_time' => '2014-03-28t15:00:00+1100',         'end_time' => '2014-03-28t15:30:00+1100'     ) );  $booked = array(); foreach ($existing_time $ex) {     $dt = new datetime($ex['start_time']);     $booked[] = $dt->format('h:ia'); }  $previous = ''; foreach ($period $dt) {     $current = $dt->format("h:ia");     if (!empty($previous) && !in_array($previous, $booked)) {         echo "<input name='time' type='radio' value='{$previous}|{$current}'> {$previous}-{$current}<br/>";     }     $previous = $current; }

see in action


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