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    <p>Same basic principle as in Zuker's response but instead of relying on a continous array using a "previous state" variable.</p> <pre><code>&lt;?php $result = array(); // * $end = '00:00:00'; foreach( getData() as $d ) { if ( $d['start_time']!=$end ) { $result[] = array('name'=&gt;'available', 'start_time'=&gt;$end, 'finish_time'=&gt;$d['start_time'] ); } $end = $d['finish_time']; $result[] = $d; } // * $result[] = array('name'=&gt;'available', 'start_time'=&gt;$end, 'finish_time'=&gt;'23:59:59' ); print_r($result); function getData() { return array( array( 'name'=&gt;'event A', 'start_time'=&gt;'01:45:00', 'finish_time'=&gt;'02:30:15' ), array( 'name'=&gt;'event B', 'start_time'=&gt;'02:30:15', 'finish_time'=&gt;'03:00:00' ), array( 'name'=&gt;'event C', 'start_time'=&gt;'03:15:00', 'finish_time'=&gt;'06:15:00' ), ); } </code></pre> <p>prints</p> <pre><code>Array ( [0] =&gt; Array ( [name] =&gt; available [start_time] =&gt; 00:00:00 [finish_time] =&gt; 01:45:00 ) [1] =&gt; Array ( [name] =&gt; event A [start_time] =&gt; 01:45:00 [finish_time] =&gt; 02:30:15 ) [2] =&gt; Array ( [name] =&gt; event B [start_time] =&gt; 02:30:15 [finish_time] =&gt; 03:00:00 ) [3] =&gt; Array ( [name] =&gt; available [start_time] =&gt; 03:00:00 [finish_time] =&gt; 03:15:00 ) [4] =&gt; Array ( [name] =&gt; event C [start_time] =&gt; 03:15:00 [finish_time] =&gt; 06:15:00 ) [5] =&gt; Array ( [name] =&gt; available [start_time] =&gt; 06:15:00 [finish_time] =&gt; 23:59:59 ) ) </code></pre> <p>(*) this does not cover events that begin on the previous day and end on the current day or begin on the current day and end on the next day. For brevity's sake I left out the date part, but those "edge cases" should be trivial.</p>
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    1. POGiven a list of events in a day, how would I calculate instead the gaps between those events?
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