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@ 2020-07-24T00:50:33Z

<?php

$events = [
  [
    'date' => '1st June',
    'events' => [
      [
        'location' => 'Venue A',
        'name' => 'Pete',
        'time' => '4.00pm'
      ],
      [
        'location' => 'Venue A',
        'name' => 'John',
        'time' => '4.30pm'
      ],
      [
        'location' => 'Venue B',
        'name' => 'Chris',
        'time' => '7.30pm'
      ],
      [
        'location' => 'Venue A',
        'name' => 'Mark',
        'time' => '8.00pm'
      ]
    ]
  ],
  [
    'date' => '2nd June',
    'events' => [
      [
        'location' => 'Venue B',
        'name' => 'Fred',
        'time' => '5.00pm'
      ],
      [
        'location' => 'Venue C',
        'name' => 'Boris',
        'time' => '6.00pm'
      ],
      [
        'location' => 'Venue A',
        'name' => 'Rupert',
        'time' => '7.00pm'
      ],
      [
        'location' => 'Venue A',
        'name' => 'Davis',
        'time' => '9.00pm'
      ]
    ]
  ]
];

$resultEvents = [];

foreach ($events as ['date' => $date, 'events' => $dayEvents]) {
  $resultDayEvents = ['date' => $date, 'events' => []];
  
  foreach ($dayEvents as ['location' => $location, 'name' => $name, 'time' => $time]) {
    $attendee = ['name' => $name, 'time' => $time];
    if ($location === ($previousLocation ?? null)) {
      $resultDayEvents['events'][array_key_last($resultDayEvents['events'])]['attendees'][] = $attendee;
    } else {
      $resultDayEvents['events'][] = ['location' => $location, 'attendees' => [$attendee]];
    }
    $previousLocation = $location;
  }
  
  $resultEvents[] = $resultDayEvents;
}

print_r($resultEvents);

Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11: Array ( [0] => Array ( [date] => 1st June [events] => Array ( [0] => Array ( [location] => Venue A [attendees] => Array ( [0] => Array ( [name] => Pete [time] => 4.00pm ) [1] => Array ( [name] => John [time] => 4.30pm ) ) ) [1] => Array ( [location] => Venue B [attendees] => Array ( [0] => Array ( [name] => Chris [time] => 7.30pm ) ) ) [2] => Array ( [location] => Venue A [attendees] => Array ( [0] => Array ( [name] => Mark [time] => 8.00pm ) ) ) ) ) [1] => Array ( [date] => 2nd June [events] => Array ( [0] => Array ( [location] => Venue B [attendees] => Array ( [0] => Array ( [name] => Fred [time] => 5.00pm ) ) ) [1] => Array ( [location] => Venue C [attendees] => Array ( [0] => Array ( [name] => Boris [time] => 6.00pm ) ) ) [2] => Array ( [location] => Venue A [attendees] => Array ( [0] => Array ( [name] => Rupert [time] => 7.00pm ) [1] => Array ( [name] => Davis [time] => 9.00pm ) ) ) ) ) )
Output for 7.2.0 - 7.2.33: Fatal error: Uncaught Error: Call to undefined function array_key_last() in /in/bC4LK:64 Stack trace: #0 {main} thrown in /in/bC4LK on line 64
Process exited with code 255.

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