3v4l.org

run code in 500+ PHP versions simultaneously

@ 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));

print_r: documentation ( source)

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