protected function filterControl(string $delimiter, string $enclosure, string $escape, string $caller): array
    {
        $controls = ['delimiter' => $delimiter, 'enclosure' => $enclosure, 'escape' => $escape];
        foreach ($controls as $type => $control) {
            if ('escape' === $type && '' === $control && 70400 <= PHP_VERSION_ID) {
                continue;
            }

            if (1 !== strlen($control)) {
                throw new Exception(sprintf('%s() expects %s to be a single character', $caller, $type));
            }
        }

        return array_values($controls);
    }
protected function filterControl(string $delimiter, string $enclosure, string $escape, string $caller): array
    {
        $controls = ['delimiter' => $delimiter, 'enclosure' => $enclosure, 'escape' => $escape];
        foreach ($controls as $type => $control) {
            if ('escape' === $type && '' === $control && 70400 <= PHP_VERSION_ID) {
                continue;
            }

            if (1 !== strlen($control)) {
                throw new Exception(sprintf('%s() expects %s to be a single character', $caller, $type));
            }
        }

        return array_values($controls);
    }
protected function filterControl ( string $ delimiter , string $ enclosure , string $ escape , string $ caller ) : array { $ controls = [ 'delimiter' => $ delimiter , 'enclosure' => $ enclosure , 'escape' => $ escape ] ; foreach ( $ controls as $ type => $ control ) { if ( 'escape' === $ type && '' === $ control && 70400 <= PHP_VERSION_ID ) { continue ; } if ( 1 !== strlen ( $ control ) ) { throw new Exception ( sprintf ( '%s() expects %s to be a single character' , $ caller , $ type ) ) ; } } return array_values ( $ controls ) ; }
Filter Csv control characters.

@throws Exception If the Csv control character is not one character only.
Filter Csv control characters .