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@ 2018-07-24T15:04:37Z

<?php
$yaml = [
    'components' => [
        [
            'cachet' => [
                'componentgroup' => 'FOO',
                'componentname' => 'BAR'
            ]
        ],
        [
            'cachet' => [
                'componentgroup' => 'Key1',
                'componentname' => 'Value1'
            ]
        ],
        [
            'cachet' => [
                'componentgroup' => 'Key2',
                'componentname' => 'Value2'
            ]
        ],
        [
            'cachet' => [
                'componentgroup' => 'FOO',
                'componentname' => 'BAZ'
            ]
        ],
        [
            'cachet' => [
                'componentgroup' => 'Key3',
                'componentname' => 'Value3'
            ]
        ]
    ]
];

$yamlMap = [];
foreach ($yaml['components'] as $yamlComponent) {
    $k = $yamlComponent['cachet']['componentgroup'];
    $v = $yamlComponent['cachet']['componentname'];
    $yamlMap[$k] = isset($yamlMap[$k]) ? array_merge((array)$yamlMap[$k], [$v]) : $v;
}

var_export($yamlMap);

Output for git.master_jit, git.master, rfc.property-hooks: array ( 'FOO' => array ( 0 => 'BAR', 1 => 'BAZ', ), 'Key1' => 'Value1', 'Key2' => 'Value2', 'Key3' => 'Value3', )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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