array_keys

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Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Return all the keys or a subset of the keys of an array
<?php array_keys(array $array): array
<?php             return ($background ? '10' : '9') . self::BRIGHT_COLORS[$color];

        }



        throw new InvalidArgumentException(sprintf('Invalid "%s" color; expected one of (%s).', $color, implode(', ', array_merge(array_keys(self::COLORS), array_keys(self::BRIGHT_COLORS)))));

    }
src/Base/Color.php