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@ 2019-05-22T12:16:32Z

<?php
$arr = [
    "36736" =>
    [
        "meta" =>
        [
            "Closing Date"         => "",
            "Technical Consultant" => "",
            "Client Name"          => "",
            "Stage"                => "Waiting for Technical Assignment",
            "Contract Name"        => "",
            "Signing Rate"         => "",
            "Contract Number"      => "",
            "Client Number"        => "",
            "Closer Name"          => "",
            "Completed On"         => "2019-05-23",
            "Assigned Date"        => "05/22/2019 12:28 pm",
        ],
    ],
];

$keys = ["Client Name", "Client Number", "Contract Name", "Contract Number", "Stage", "Closing Date",
    "Technical Consultant", "Signing Rate", "Closer Name", "Completed On", "Assigned Date"];
foreach ($arr as $key => &$value) { // & defines changes will be reflected at its address in memory
    $value['meta'] = array_replace(array_flip($keys), $value["meta"]);
}
print_r($arr);die;

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [36736] => Array ( [meta] => Array ( [Client Name] => [Client Number] => [Contract Name] => [Contract Number] => [Stage] => Waiting for Technical Assignment [Closing Date] => [Technical Consultant] => [Signing Rate] => [Closer Name] => [Completed On] => 2019-05-23 [Assigned Date] => 05/22/2019 12:28 pm ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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