next - PHP code example

How to Define a PHP Function Next()

PHP is a server-side programming language that’s used to create dynamic websites and applications. Its function syntax allows developers to create reusable modular blocks of code that can be called upon and executed whenever they need to perform an action or calculate a value. These functions can then return the result of their work to the caller, making the entire codebase more manageable and reducing code duplication.

The next() function moves the internal pointer of an array to the next element (if present). When combined with loops, this function is used to iterate through an array and display its elements. It also returns False if the internal pointer of the array is past the last element or not pointing to any element at all.

When defining a PHP function, it’s important to use descriptive and meaningful names that reflect their purpose. This will help you to easily understand the functionality of a function when reading or writing your code. It’s also a good idea to use the same naming conventions throughout your project to ensure consistency and readability.

Functions in PHP are called using variable callable expressions. These expressions must contain a variable name, type, and value. You can also define a parameter within a function by separating it with a comma, which will be used to pass values to the function during runtime.

Functions are a powerful way to reduce code duplication and create reusable modules of code. They can be called multiple times by passing different values as inputs, and will always return a value to the caller.

next example

return new Stream($resource, $options);
            case 'object':
                /** @var object $resource */
                if ($resource instanceof StreamInterface) {
                    return $resource;
                } elseif ($resource instanceof \Iterator) {
                    return new PumpStream(function D) use ($resource) {
                        if (!$resource->valid()) {
                            return false;
                        }
                        $result = $resource->current();
                        $resource->next();

                        return $result;
                    }, $options);
                } elseif (method_exists($resource, '__toString')) {
                    return self::streamFor((string) $resource, $options);
                }
                break;
            case 'NULL':
                return new Stream(self::tryFopen('php://temp', 'r+'), $options);
        }

public function __construct(ManagerRegistry $managerRegistry, string $entityManagerName = null, LoggerInterface $logger = null)
    {
        parent::__construct($managerRegistry, $entityManagerName);

        $this->logger = $logger;
    }

    protected function handleForManager(EntityManagerInterface $entityManager, Envelope $envelope, StackInterface $stack): Envelope
    {
        try {
            return $stack->next()->handle($envelope, $stack);
        } finally {
            if ($entityManager->getConnection()->isTransactionActive()) {
                $this->logger?->error('A handler opened a transaction but did not close it.', [
                    'message' => $envelope->getMessage(),
                ]);
            }
        }
    }
}

        $lineno = $token->getLine();
        $expr = $this->parser->getExpressionParser()->parseExpression();
        $stream = $this->parser->getStream();
        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
        $body = $this->parser->subparse([$this, 'decideIfFork']);
        $tests = [$expr, $body];
        $else = null;

        $end = false;
        while (!$end) {
            switch ($stream->next()->getValue()) {
                case 'else':
                    $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
                    $else = $this->parser->subparse([$this, 'decideIfEnd']);
                    break;

                case 'elseif':
                    $expr = $this->parser->getExpressionParser()->parseExpression();
                    $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
                    $body = $this->parser->subparse([$this, 'decideIfFork']);
                    $tests[] = $expr;
                    $tests[] = $body;

    /** * @return array|bool */
    public function each()
    {
        if (!$this->valid()) {
            return false;
        }
        $result = [$this->key(), $this->current()];
        $this->next();

        return $result;
    }
}

if (!$this->allowNoHandlers) {
                throw new NoHandlerForMessageException(sprintf('No handler for message "%s".', $context['class']));
            }

            $this->logger?->info('No handler for message {class}', $context);
        }

        if (\count($exceptions)) {
            throw new HandlerFailedException($envelope, $exceptions);
        }

        return $stack->next()->handle($envelope, $stack);
    }

    private function messageHasAlreadyBeenHandled(Envelope $envelope, HandlerDescriptor $handlerDescriptor): bool
    {
        /** @var HandledStamp $stamp */
        foreach ($envelope->all(HandledStamp::class) as $stamp) {
            if ($stamp->getHandlerName() === $handlerDescriptor->getName()) {
                return true;
            }
        }

return $envelope;
            }

            $envelope = $envelope->withoutAll(DispatchAfterCurrentBusStamp::class);
        }

        if ($this->isRootDispatchCallRunning) {
            /* * A call to MessageBusInterface::dispatch() was made from inside the main bus handling, * but the message does not have the stamp. So, process it like normal. */
            return $stack->next()->handle($envelope, $stack);
        }

        // First time we get here, mark as inside a "root dispatch" call:         $this->isRootDispatchCallRunning = true;
        try {
            // Execute the whole middleware stack & message handling for main dispatch:             $returnedEnvelope = $stack->next()->handle($envelope, $stack);
        } catch (\Throwable $exception) {
            /* * Whenever an exception occurs while handling a message that has * queued other messages, we drop the queued ones. * This is intentional since the queued commands were likely dependent * on the preceding command. */

// If the parent is zero, we are at the start of a book.     if ($book_link['pid'] == 0) {
      return NULL;
    }
    $flat = $this->bookManager->bookTreeGetFlat($book_link);
    reset($flat);
    $curr = NULL;
    do {
      $prev = $curr;
      $key = key($flat);
      $curr = current($flat);
      next($flat);
    } while ($key && $key != $book_link['nid']);

    if ($key == $book_link['nid']) {
      // The previous page in the book may be a child of the previous visible link.       if ($prev['depth'] == $book_link['depth']) {
        // The subtree will have only one link at the top level - get its data.         $tree = $this->bookManager->bookSubtreeData($prev);
        $data = array_shift($tree);
        // The link of interest is the last child - iterate to find the deepest one.         while ($data['below']) {
          $data = end($data['below']);
        }

$this->assertSame(1, $it->current());

        // dynamic modification         $map['added'] = 2;

        // iterator is unchanged         $this->assertTrue($it->valid());
        $this->assertSame('first', $it->key());
        $this->assertSame(1, $it->current());

        // continue iteration         $it->next();
        $this->assertTrue($it->valid());
        $this->assertSame('added', $it->key());
        $this->assertSame(2, $it->current());

        // end of map         $it->next();
        $this->assertFalse($it->valid());
        $this->assertNull($it->key());
        $this->assertNull($it->current());
    }

'query' => $sql,
                'success' => false,
                'offset' => $offset,
                'errorMsg' => $e->getMessage(),
            ];

            $response->body(json_encode($data));

            return;
        }

        $dump->next();
    }

    $data = [
        'valid' => $dump->valid(),
        'offset' => $dump->key(),
        'totalCount' => $totalCount,
        'success' => true,
    ];

    $response->body(json_encode($data));
})->via('GET', 'POST')->name('applyMigrations');

    public function parse(Token $token): Node
    {
        $lineno = $token->getLine();
        $stream = $this->parser->getStream();
        $targets = $this->parser->getExpressionParser()->parseAssignmentExpression();
        $stream->expect(/* Token::OPERATOR_TYPE */ 8, 'in');
        $seq = $this->parser->getExpressionParser()->parseExpression();

        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
        $body = $this->parser->subparse([$this, 'decideForFork']);
        if ('else' == $stream->next()->getValue()) {
            $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
            $else = $this->parser->subparse([$this, 'decideForEnd'], true);
        } else {
            $else = null;
        }
        $stream->expect(/* Token::BLOCK_END_TYPE */ 3);

        if (\count($targets) > 1) {
            $keyTarget = $targets->getNode(0);
            $keyTarget = new AssignNameExpression($keyTarget->getAttribute('name'), $keyTarget->getTemplateLine());
            $valueTarget = $targets->getNode(1);
        }

// allow access to the individual entries without relying on their indices         reset($this->choices);
        reset($this->values);
        reset($this->keys);

        for ($i = 1; $i <= 4; ++$i) {
            $this->{'choice'.$i} = current($this->choices);
            $this->{'value'.$i} = current($this->values);
            $this->{'key'.$i} = current($this->keys);

            next($this->choices);
            next($this->values);
            next($this->keys);
        }
    }

    public function testGetChoices()
    {
        $this->assertSame($this->choices, $this->list->getChoices());
    }

    public function testGetValues()
    {

    public function parseUseStatement()
    {
        $groupRoot     = '';
        $class         = '';
        $alias         = '';
        $statements    = [];
        $explicitAlias = false;
        while (($token = $this->next())) {
            if (! $explicitAlias && $token[0] === T_STRING) {
                $class .= $token[1];
                $alias  = $token[1];
            } elseif ($explicitAlias && $token[0] === T_STRING) {
                $alias = $token[1];
            } elseif (
                PHP_VERSION_ID >= 80000 &&
                ($token[0] === T_NAME_QUALIFIED || $token[0] === T_NAME_FULLY_QUALIFIED)
            ) {
                $class .= $token[1];

$h = null;
            };
        }

        if (\is_string($body)) {
            return $body;
        }

        $generatorToCallable = static fn (\Generator $body): \Closure => static function D) use ($body) {
            while ($body->valid()) {
                $chunk = $body->current();
                $body->next();

                if ('' !== $chunk) {
                    return $chunk;
                }
            }

            return '';
        };

        if ($body instanceof \Generator) {
            return $generatorToCallable($body);
        }

$this->query->range($this->batch * $this->batchSize, $this->batchSize);
    }
    $statement = $this->query->execute();
    $statement->setFetchMode(\PDO::FETCH_ASSOC);
    return new \IteratorIterator($statement);
  }

  /** * Position the iterator to the following row. */
  protected function fetchNextRow() {
    $this->getIterator()->next();
    // We might be out of data entirely, or just out of data in the current     // batch. Attempt to fetch the next batch and see.     if ($this->batchSize > 0 && !$this->getIterator()->valid()) {
      $this->fetchNextBatch();
    }
  }

  /** * Prepares query for the next set of data from the source database. */
  protected function fetchNextBatch() {

$input = null;
            } elseif (\is_resource($input = $input->current())) {
                stream_set_blocking($input, 0);
            } elseif (!isset($this->inputBuffer[0])) {
                if (!\is_string($input)) {
                    if (!\is_scalar($input)) {
                        throw new InvalidArgumentException(sprintf('"%s" yielded a value of type "%s", but only scalars and stream resources are supported.', get_debug_type($this->input), get_debug_type($input)));
                    }
                    $input = (string) $input;
                }
                $this->inputBuffer = $input;
                $this->input->next();
                $input = null;
            } else {
                $input = null;
            }
        }

        $r = $e = [];
        $w = [$this->pipes[0]];

        // let's have a look if something changed in streams         if (false === @stream_select($r, $w, $e, 0, 0)) {