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An interface representing a single part of an email.

The base type for a message or any child part of a message. The part may contain content, have a parent, and identify the type of content (e.g. mime-type or charset) agnostically.

The interface extends SplSubject -- any modifications to a message must notify any attached observers.

AbstractInterface
Methods
public abstract __toString() : string
 

Returns the message/part as a string, containing its headers, content and children.

Convenience method for calling getContents() on {@see \IMessagePart::getStream()}.

  • see \IMessagePart::getStream()to get a Psr7 StreamInterface instead of a string.
  • see \IMessagePart::getResourceHandle()to get a resource handle.
  • see \IMessage::save()to write the part to a file, resource handle or Psr7 stream.
public abstract SplSubject::attach(SplObserver $observer)
public abstract attachContentStream(Psr\Http\Message\StreamInterface $stream, string $streamCharset = 'UTF-8'ZBateson\MailMimeParser\MailMimeParser::DEFAULT_CHARSET)
 

Attaches the stream or resource handle for the part's content. The stream is closed when another stream is attached, or the MimePart is destroyed.

  • see \IMessagePart::setContent()to pass a string as the content.
  • see \IMessagePart::getContentStream()to get the content stream.
  • see \IMessagePart::detachContentStream()to detach the content stream.
  • param \StreamInterface $stream the content
  • param string $streamCharset the charset of $stream
public abstract SplSubject::detach(SplObserver $observer)
public abstract detachContentStream()
 

Detaches the content stream.

  • see \IMessagePart::getContentStream()to get the content stream.
  • see \IMessagePart::attachContentStream()to attach a content stream.
public abstract getBinaryContentResourceHandle()
 

Returns a resource handle for the content's raw data stream, or null if the part doesn't have a content stream.

The method wraps a call to {@see \IMessagePart::getBinaryContentStream()} and returns a resource handle for the returned Stream.

  • see \IMessagePart::getBinaryContentStream()to get a stream instead.
  • see \IMessagePart::saveContent()to save the binary contents to file.
  • return resource|null the resource
public abstract getBinaryContentStream()
 

Returns the raw data stream for the current part, if it exists, or null if there's no content associated with the stream.

This is basically the same as calling {@see \IMessagePart::getContentStream()}, except no automatic charset conversion is done. Note that for non-text streams, this doesn't have an effect, as charset conversion is not performed in that case, and is useful only when:

  • The charset defined is not correct, and the conversion produces errors; or
  • You'd like to read the raw contents without conversion, for instance to save it to file or allow a user to download it as-is (in a download link for example).
  • see \IMessagePart::getContentStream()to get the content stream with charset conversions applied.
  • see \IMessagePart::getBinaryContentResourceHandle()to get a resource handle instead.
  • see \IMessagePart::saveContent()to save the binary contents to file.
  • return \StreamInterface|null the stream
public abstract getCharset() : ?string
 

Returns the charset of the content, or null if not applicable/defined.

  • return string|null the charset
public abstract getContent(string $charset = 'UTF-8'ZBateson\MailMimeParser\MailMimeParser::DEFAULT_CHARSET) : ?string
 

Shortcut to reading stream content and assigning it to a string. Returns null if the part doesn't have a content stream.

The returned string is encoded to the passed $charset character encoding.

  • see \IMessagePart::getContentStream()
  • param string $charset the target charset for the returned string
  • return string|null the content
public abstract getContentDisposition(?string $default = NULL) : ?string
 

Returns the content's disposition, or returns the value of $default if not defined.

  • param string $default Optional default value to return if not applicable/defined
  • return string|null the disposition.
public abstract getContentId() : ?string
 

Returns the Content ID of the part, or null if not defined.

  • return string|null the content ID.
public abstract getContentStream(string $charset = 'UTF-8'ZBateson\MailMimeParser\MailMimeParser::DEFAULT_CHARSET)
 

Returns the StreamInterface for the part's content or null if the part doesn't have a content section.

To get a stream without charset conversion if you know the part's content contains a binary stream, call {@see \self::getBinaryContentStream()} instead.

The library automatically handles decoding and charset conversion (to the target passed $charset) based on the part's transfer encoding as returned by {@see \IMessagePart::getContentTransferEncoding()} and the part's charset as returned by {@see \IMessagePart::getCharset()}. The returned stream is ready to be read from directly.

Note that the returned Stream is a shared object. If called multiple times with the same $charset, and the value of the part's Content-Transfer-Encoding header has not changed, the stream will be rewound. This would affect other existing variables referencing the stream, for example:

// assuming $part is a part containing the following
// string for its content: '12345678'
$stream = $part->getContentStream();
$someChars = $part->read(4);

$stream2 = $part->getContentStream();
$moreChars = $part->read(4);
echo ($someChars === $moreChars);    //1

In this case the Stream was rewound, and $stream's second call to read 4 bytes reads the same first 4.

  • see \IMessagePart::getBinaryContentStream()to get the content stream without any charset conversions.
  • see \IMessagePart::saveContent()to save the binary contents to file.
  • see \IMessagePart::setCharsetOverride()to override the charset of the content and ignore the charset returned from calling IMessagePart::getCharset() when reading.
  • param string $charset Optional charset for the returned stream.
  • return \StreamInterface|null the stream
public abstract getContentTransferEncoding(?string $default = NULL) : ?string
 

Returns the content transfer encoding used to encode the content on this part, or the value of $default if not defined.

  • param mixed $default Optional default value to return if not applicable/defined
  • return string|null the transfer encoding defined for the part.
public abstract getContentType(string $default = 'text/plain') : ?string
 

Returns the mime type of the content, or $default if one is not set.

  • param string $default Optional override for the default return value of 'text/plain.
  • return string the mime type
public abstract getFilename() : ?string
 

Returns a filename for the part if one is defined, or null otherwise.

  • return string|null the file name
public abstract getParent()
 

Returns this part's parent.

  • return \IMimePart the parent part
public abstract getResourceHandle()
 

Returns a resource handle for the string representation of this part, containing its headers, content and children. For an IMessage, this would be the entire RFC822 (or greater) email.

If the part has not been modified and represents a parsed part, the original stream should be returned. Otherwise a stream representation of the part including its modifications should be returned. This insures that an unmodified, signed message could be passed on that way even after parsing and reading.

The returned stream is not guaranteed to be RFC822 (or greater) compliant for the following reasons:

  • The original email or part, if not modified, is returned as-is and may not be compliant.
  • Although certain parts may have been modified, an original unmodified header from the original email or part may not be compliant.
  • A user may set headers in a non-compliant format.
  • see \IMessagePart::getStream()to get a Psr7 StreamInterface instead of a resource handle.
  • see \IMessagePart::__toString()to write the part to a string and return it.
  • see \IMessage::save()to write the part to a file, resource handle or Psr7 stream.
  • return resource the resource handle containing the part.
public abstract getStream()
 

Returns a Psr7 StreamInterface for the string representation of this part, containing its headers, content and children.

If the part has not been modified and represents a parsed part, the original stream should be returned. Otherwise a stream representation of the part including its modifications should be returned. This insures that an unmodified, signed message could be passed on that way even after parsing and reading.

The returned stream is not guaranteed to be RFC822 (or greater) compliant for the following reasons:

  • The original email or part, if not modified, is returned as-is and may not be compliant.
  • Although certain parts may have been modified, an original unmodified header from the original email or part may not be compliant.
  • A user may set headers in a non-compliant format.
  • see \IMessagePart::getResourceHandle()to get a resource handle.
  • see \IMessagePart::__toString()to write the part to a string and return it.
  • see \IMessage::save()to write the part to a file, resource handle or Psr7 stream.
  • return \StreamInterface the stream containing the part.
public abstract hasContent() : bool
 

Returns true if the part contains a 'body' (content).

public abstract isMime() : bool
 

Returns true if the current part is a mime part.

public abstract isTextPart() : bool
 

Returns true if the content of this part is plain text.

public abstract SplSubject::notify()
public abstract save( $filenameResourceOrStream, string $filemode = 'w+')
 

Writes a string representation of this part, including its headers, content and children to the passed file, resource, or stream.

If the part has not been modified and represents a parsed part, the original stream should be written to the file. Otherwise a stream representation of the part including its modifications should be written. This insures that an unmodified, signed message could be passed on this way even after parsing and reading.

The written stream is not guaranteed to be RFC822 (or greater) compliant for the following reasons:

  • The original email or part, if not modified, is returned as-is and may not be compliant.
  • Although certain parts may have been modified, an original unmodified header from the original email or part may not be compliant.
  • A user may set headers in a non-compliant format.

If the passed $filenameResourceOrStream is a string, it's assumed to be a filename to write to.

When passing a resource or Psr7 Stream, the resource is not closed, nor rewound after being written to.

  • see \IMessagePart::getResourceHandle()to get a resource handle.
  • see \IMessagePart::__toString()to get the part in a string.
  • see \IMessage::save()to write the part to a file, resource handle or Psr7 stream.
  • param string|resource|\StreamInterface $filenameResourceOrStream the file, resource, or stream to write to.
  • param string $filemode Optional filemode to open a file in (if $filenameResourceOrStream is a string)
public abstract saveContent( $filenameResourceOrStream)
 

Saves the binary content of the stream to the passed file, resource or stream.

Note that charset conversion is not performed in this case, and the contents of the part are saved in their binary format as transmitted (but after any content-transfer decoding is performed). {@see \IMessagePart::getBinaryContentStream()} for a more detailed description of the stream.

If the passed parameter is a string, it's assumed to be a filename to write to. The file is opened in 'w+' mode, and closed before returning.

When passing a resource or Psr7 Stream, the resource is not closed, nor rewound.

  • see \IMessagePart::getContentStream()to get the content stream with charset conversions applied.
  • see \IMessagePart::getBinaryContentStream()to get the content as a binary stream.
  • see \IMessagePart::getBinaryContentResourceHandle()to get the content as a resource handle.
  • param string|resource|\StreamInterface $filenameResourceOrStream
public abstract setCharsetOverride(string $charsetOverride, bool $onlyIfNoCharset = false)
 

Overrides the default character set used for reading content from content streams in cases where a user knows the source charset is not what is specified.

If set, the returned value from {@see \IMessagePart::getCharset()} must be ignored during subsequent read operations and streams created out of this part's content.

Note that setting an override on an {@see \ZBateson\MailMimeParser\IMessage} and calling getTextStream, getTextContent, getHtmlStream or getHtmlContent will not be applied to those sub-parts, unless the text/html part is the IMessage itself. Instead, {@see \ZBateson\MailMimeParser\IMessage::getTextPart()} should be called, and setCharsetOverride called on the returned IMessagePart.

  • see \IMessagePart::getContentStream()to get the content stream.
  • param string $charsetOverride the actual charset of the content.
  • param bool $onlyIfNoCharset if true, $charsetOverride is used only if getCharset returns null.
public abstract setContent( $resource, string $resourceCharset = 'UTF-8'ZBateson\MailMimeParser\MailMimeParser::DEFAULT_CHARSET)
 

Sets the content of the part to the passed string, resource, or stream.

  • see \IMessagePart::getContentStream()to get the content stream.
  • see \IMessagePart::attachContentStream()to attach a content stream.
  • see \IMessagePart::detachContentStream()to detach the content stream.
  • param string|resource|\StreamInterface $resource the content.
  • param string $resourceCharset the charset of the passed $resource.
© 2024 Bruce Wells
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