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@ 2018-04-06T02:53:19Z

<?php

$v = Array(
    'ccrs_date',
    Array(
            'prelim_title_report_date',
            Array(
                    'additional_escrow_deposit_date',
                     Array(
                            'earnest_money_date',
                            Array(
                                    'acceptance_date',
                                    Array(
                                            'contract_date',
                                            Array(
                                                    'prelim_title_report_date' 
                                                )

                                        )

                                )

                        )

                )

        )
);

function get_zero_index(array $array, &$result = []) {
    foreach($array as $i => $v) {
        if ($i === 0 && is_string($v)) {
            $result[] = $v;
        } elseif(is_array($v)) {
           get_zero_index($v, $result);
        }
    }
    return $result;
}

print_r(get_zero_index($v));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => ccrs_date [1] => prelim_title_report_date [2] => additional_escrow_deposit_date [3] => earnest_money_date [4] => acceptance_date [5] => contract_date [6] => prelim_title_report_date )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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