Online PHP editor | output for kboC7

@ 2016-04-27T00:56:27Z

<?php

    $calendar = 
    [
        'p1' => [
            ['start' => '2016-04-30 12:00', 'end' => '2016-05-01 03:00']
        ],
        'p2' => [
            ['start' => '2016-04-30 03:00', 'end' => '2016-05-01 03:00']
        ],
        'p3' => [
            ['start' => '2016-04-30 03:00', 'end' => '2016-04-30 13:31'],
            ['start' => '2016-04-30 15:26', 'end' => '2016-05-01 03:00']
        ]
    ];

    $tz   = new DateTimeZone( date_default_timezone_get() );
    $flat = call_user_func_array( 'array_merge', $calendar );
    $min  = date_create( min( array_column( $flat, 'start' ) ) )->getTimestamp()/60;
    $max  = date_create( max( array_column( $flat, 'end' ) ) )->getTimestamp()/60;

    $free = gmp_sub( gmp_pow( 2, $max-$min ), gmp_pow( 2, 0 ) );

    foreach( $calendar as $p )
    {
        $pf = gmp_init( 0 );
        foreach( $p as $time )
        {
            $start = date_create( $time['start'] )->getTimestamp()/60;
            $end   = date_create( $time['end'] )->getTimestamp()/60;
            $pf = gmp_or( $pf, gmp_sub( gmp_pow( 2, $end-$min ), gmp_pow( 2, $start-$min ) ) );
        }
        $free = gmp_and( $free, $pf );
    }

    $result = [];
    $start = $end = 0;

    while( ($start = gmp_scan1( $free, $end )) >= 0 )
    {
        $end = gmp_scan0( $free, $start );
        if( $end === False) $end = strlen( gmp_strval( $free, 2 ) )-1;
        $result[] =
        [
            'start' => date_create( '@'.($start+$min)*60 )->setTimezone( $tz )->format( 'Y-m-d H:i:s' ),
            'end'   => date_create( '@'.($end+$min)*60 )->setTimezone( $tz )->format( 'Y-m-d H:i:s' )
        ];
    }

    print_r( $result );

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: Fatal error: Uncaught ArgumentCountError: array_merge() does not accept unknown named parameters in /in/kboC7:18 Stack trace: #0 /in/kboC7(18): array_merge(p1: Array, p2: Array, p3: Array) #1 {main} thrown in /in/kboC7 on line 18
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.33: Fatal error: Uncaught Error: Call to undefined function gmp_sub() in /in/kboC7:22 Stack trace: #0 {main} thrown in /in/kboC7 on line 22
Process exited with code 255.
Output for 5.5.17, 5.6.0 - 5.6.20, 7.0.0 - 7.0.5, 7.2.29 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.32: Array ( [0] => Array ( [start] => 2016-04-30 12:00:00 [end] => 2016-04-30 13:31:00 ) [1] => Array ( [start] => 2016-04-30 15:26:00 [end] => 2016-05-01 03:00:00 ) )
Output for 5.5.0 - 5.5.16, 5.5.18 - 5.5.34: Fatal error: Call to undefined function gmp_sub() in /in/kboC7 on line 22
Process exited with code 255.
Output for 5.4.0 - 5.4.45: Fatal error: Call to undefined function array_column() in /in/kboC7 on line 19
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/kboC7 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/kboC7 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/kboC7 on line 4
Process exited with code 255.

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