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@ 2019-02-27T07:52:29Z

<?php
$array = array (
    0 => 
    array (
        'week_startDate' => '2019-02-01',
        'week_endDate' => '2019-02-03'
    ),
    1 => 
    array (
        'week_startDate' => '2019-02-04',
        'week_endDate' => '2019-02-10'
    ),
    2 => 
    array (
        'week_startDate' => '2019-02-11',
        'week_endDate' => '2019-02-17'
    ),
    3 => 
    array (
        'week_startDate' => '2019-02-18',
        'week_endDate' => '2019-02-24'
    ),
    4 => 
    array (
        'week_startDate' => '2019-02-25',
        'week_endDate' => '2019-02-28'
    )
);

$startDate = '2019-02-01';
$k = array_search($startDate, array_column($array, 'week_startDate'));
if ($k !== false) {
    $endDate = $array[$k]['week_endDate'];
    echo "end date is $endDate";
}
else {
    echo "$startDate not found!";
}

Output for git.master, git.master_jit, rfc.property-hooks: end date is 2019-02-03

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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