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@ 2020-03-09T13:36:05Z

<?php

const DATA = [
    [1070, 1023, 'this is the first record'],
    [1070, 1028, 'this is the second record'],
    [1098, 1023, 'this is the thrid record'],
    [1098, 1028, 'this is the fourth record'],
    [2021, 1023, 'this is the fifth record'],
    [2021, 1028, 'this is the sixth record'],
];

function group_records(array $data, int $col)
{
    $last = null;
    $current = [];

    foreach (DATA as $row) {
        if ($row[$col] !== $last && $last !== null) {
            yield $last => $current;
            $last = null;
            $current = [];
        }
        
        $last = $row[$col];
        $current[] = $row;
    }
    
    if ($last !== null) {
        yield $last => $current;
    }
}

foreach (group_records(DATA, 0) as $key => $rows) {
    echo "$key:\n";
    foreach ($rows as $row) echo "  " . implode('|', $row) . "\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: 1070: 1070|1023|this is the first record 1070|1028|this is the second record 1098: 1098|1023|this is the thrid record 1098|1028|this is the fourth record 2021: 2021|1023|this is the fifth record 2021|1028|this is the sixth record

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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