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@ 2018-07-24T14:04:07Z

<?php

$yaml = [
    'components' => [
        [
            'cachet' => [
                'componentgroup' => 'Bar',
                'componentname' => 'Name1'
            ]
        ],
        [
            'cachet' => [
                'componentgroup' => 'Bar',
                'componentname' => 'Name2'
            ]
        ]
    ]
];

$yamlMap = [];
foreach ($yaml['components'] as $yamlComponent) {
    $key = $yamlComponent['cachet']['componentgroup'];
    $value = $yamlComponent['cachet']['componentname'];
    // Lets initialize the key to be an array so that we may collect multiple values
    if(!array_key_exists($key, $yamlMap)) {
        $yamlMap[$key] = [];
    }
    // lets add the value to the map under the key
    $yamlMap[$key][] = $value;
}

var_dump($yamlMap);

Output for git.master_jit, git.master, rfc.property-hooks: array(1) { ["Bar"]=> array(2) { [0]=> string(5) "Name1" [1]=> string(5) "Name2" } }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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