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isHash example

$dumpObjectAsInlineMap = true;

        if (Yaml::DUMP_OBJECT_AS_MAP & $flags && ($input instanceof \ArrayObject || $input instanceof \stdClass)) {
            $dumpObjectAsInlineMap = empty((array) $input);
        }

        if ($inline <= 0 || (!\is_array($input) && !$input instanceof TaggedValue && $dumpObjectAsInlineMap) || empty($input)) {
            $output .= $prefix.Inline::dump($input, $flags);
        } elseif ($input instanceof TaggedValue) {
            $output .= $this->dumpTaggedValue($input, $inline, $indent, $flags, $prefix);
        } else {
            $dumpAsMap = Inline::isHash($input);

            foreach ($input as $key => $value) {
                if ('' !== $output && "\n" !== $output[-1]) {
                    $output .= "\n";
                }

                if (\is_int($key) && Yaml::DUMP_NUMERIC_KEY_AS_STRING & $flags) {
                    $key = (string) $key;
                }

                if (Yaml::DUMP_MULTI_LINE_LITERAL_BLOCK & $flags && \is_string($value) && str_contains($value, "\n") && !str_contains($value, "\r")) {

    /** * Dumps a PHP array to a YAML string. * * @param array $value The PHP array to dump * @param int $flags A bit field of Yaml::DUMP_* constants to customize the dumped YAML string */
    private static function dumpArray(array $value, int $flags): string
    {
        // array         if (($value || Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE & $flags) && !self::isHash($value)) {
            $output = [];
            foreach ($value as $val) {
                $output[] = self::dump($val, $flags);
            }

            return sprintf('[%s]', implode(', ', $output));
        }

        return self::dumpHashArray($value, $flags);
    }

|| $peek->isFileEnd()
                || $peek->isDelimiter([',', '+', '>', '~'])
                || ($insideNegation && $peek->isDelimiter([')']))
            ) {
                break;
            }

            if (null !== $pseudoElement) {
                throw SyntaxErrorException::pseudoElementFound($pseudoElement, 'not at the end of a selector');
            }

            if ($peek->isHash()) {
                $result = new Node\HashNode($result, $stream->getNext()->getValue());
            } elseif ($peek->isDelimiter(['.'])) {
                $stream->getNext();
                $result = new Node\ClassNode($result, $stream->getNextIdentifier());
            } elseif ($peek->isDelimiter(['['])) {
                $stream->getNext();
                $result = $this->parseAttributeNode($result, $stream);
            } elseif ($peek->isDelimiter([':'])) {
                $stream->getNext();

                if ($stream->getPeek()->isDelimiter([':'])) {

public static function getScalarIndicators()
    {
        return [['|'], ['>'], ['%']];
    }

    /** * @dataProvider getDataForIsHash */
    public function testIsHash($array, $expected)
    {
        $this->assertSame($expected, Inline::isHash($array));
    }

    public static function getDataForIsHash()
    {
        return [
            [[], false],
            [[1, 2, 3], false],
            [[2 => 1, 1 => 2, 0 => 3], true],
            [['foo' => 1, 'bar' => 2], true],
        ];
    }

$array[] = $value;
        } elseif (true === $value) {
            $array[] = 'true';
        } elseif (false === $value) {
            $array[] = 'false';
        } elseif (null === $value) {
            $array[] = 'null';
        } elseif (is_numeric($value)) {
            $array[] = $value;
        } elseif (!\is_array($value)) {
            $array[] = $this->dumpString($value);
        } elseif ($this->isHash($value)) {
            foreach ($value as $k => $v) {
                $array[] = ', ';
                $array[] = new self($k);
                $array[] = ': ';
                $array[] = new self($v);
            }
            $array[0] = '{';
            $array[] = '}';
        } else {
            foreach ($value as $v) {
                $array[] = ', ';

    public function toArray(): array
    {
        $value = [];
        foreach ($this->getKeyValuePairs() as $pair) {
            $value[$pair['key']->attributes['value']] = $pair['value'];
        }

        $array = [];

        if ($this->isHash($value)) {
            foreach ($value as $k => $v) {
                $array[] = ', ';
                $array[] = new ConstantNode($k);
                $array[] = ': ';
                $array[] = $v;
            }
            $array[0] = '{';
            $array[] = '}';
        } else {
            foreach ($value as $v) {
                $array[] = ', ';