Converts first char of array keys to lowercase

maybe_convert_arraykeys_lcfirst.php

<?php
/**
 * Converts first char of array keys to lowercase
 *
 * @param $multd_array
 *
 * @return array
 */
function maybe_convert_arraykeys_lcfirst( $multd_array ) {
	$result = [];
	foreach ( $multd_array as $key => $value ) {
		$key = ( is_string( $key ) ) ? lcfirst( $key ) : $key;
		if ( is_array( $value ) ) {
			$value = $this->maybe_array_keys_lcfirst( $value );
		}
		$result[ $key ] = $value;
	}

	return $result;
}