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@ 2019-08-02T21:10:19Z

<?php

$randomInvoices = [
    [
     "name" => "studio",
     "client_id" => 111,
     "invoice" => 1233,
     "email" => 'studio@studio.com.br'
    ],
    [
     "name" => "italiano",
     "client_id" => 222,
     "invoice" =>  6775,
     "email" => 'italiano@italia.com'
    ],
    [
     "name" => "studio",
     "client_id" => 111,
     "invoice" => 577,
     "email" => 'studio@studio.com.br'
    ],
    [
     "name" => "italiano",
     "client_id" => 222,
     "invoice" =>  677543,
     "email" => 'italiano@italia.com'
    ],

];

$invoicesByClient = [];
foreach ($randomInvoices as $value) {
    $clientId = $value['client_id'];
    if (!isset($invoicesByClient[$clientId])) {
        $invoicesByClient[$clientId] = [
            "name" => $value['name'],
            "client_id" => $clientId,
            "email" => $value['email'],
            'invoices' => [],
        ];
    }
    $invoicesByClient[$clientId]['invoices'][] = $value['invoice'];
}
// use `array_values` to get 0-indexed array
$invoicesByClient = array_values($invoicesByClient);
print_r($invoicesByClient);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [name] => studio [client_id] => 111 [email] => studio@studio.com.br [invoices] => Array ( [0] => 1233 [1] => 577 ) ) [1] => Array ( [name] => italiano [client_id] => 222 [email] => italiano@italia.com [invoices] => Array ( [0] => 6775 [1] => 677543 ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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