International PHP Conference Berlin 2025

    Predefined Constants

    The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

    Available flags for stream_socket_client()
    STREAM_CLIENT_ASYNC_CONNECT (int)
    Open client socket asynchronously. This option must be used together with the STREAM_CLIENT_CONNECT flag.
    STREAM_CLIENT_CONNECT (int)
    Open client socket connection. Client sockets should always include this flag.
    STREAM_CLIENT_PERSISTENT (int)
    Client socket should remain persistent between page loads.
    Available flags for stream_socket_server()
    STREAM_SERVER_BIND (int)
    Indicates that a stream should bind to the specified target. Server sockets should always include this flag.
    STREAM_SERVER_LISTEN (int)
    Indicates that a stream bound using STREAM_SERVER_BIND flag to start listening to the socket. Connection-orientated transports (such as TCP) must use this flag, otherwise the server socket will not be enabled. Using this flag for connect-less transports (such as UDP) is an error.
    Values for the mode parameter of stream_socket_shutdown()
    STREAM_SHUT_RD (int)
    Disable further receptions.
    STREAM_SHUT_WR (int)
    Disable further transmissions.
    STREAM_SHUT_RDWR (int)
    Disable further receptions and transmissions.
    Stream Socket Transfer flags

    Those constants are used for the flags parameter of the stream_socket_recvfrom() and stream_socket_sendto() functions.

    STREAM_OOB (int)
    Process OOB (out-of-band) data.
    STREAM_PEEK (int)
    Retrieve data from the socket, but do not consume the buffer. Subsequent calls to fread() or stream_socket_recvfrom() will see the same data.

    Note: Is not a valid flag for stream_socket_sendto().

    Stream Filter constants

    Those constants are used for the stream_filter_append() and stream_filter_prepend() functions.

    STREAM_FILTER_READ (int)
    Indicate that the specified filter should only be applied when reading.
    STREAM_FILTER_WRITE (int)
    Indicate that the specified filter should only be applied when writing.
    STREAM_FILTER_ALL (int)
    Equivalent to STREAM_FILTER_READ | STREAM_FILTER_WRITE.
    Stream Crypto Methods
    STREAM_CRYPTO_METHOD_ANY_CLIENT (int)
    Any TLS or SSL version on a client stream.
    STREAM_CRYPTO_METHOD_SSLv2_CLIENT (int)
    SSL 2 on a client stream.
    STREAM_CRYPTO_METHOD_SSLv3_CLIENT (int)
    SSL 3 on a client stream.
    STREAM_CRYPTO_METHOD_SSLv23_CLIENT (int)
    TLS 1.0, 1.1 or 1.2 on a client stream.
    STREAM_CRYPTO_METHOD_TLS_CLIENT (int)
    Any TLS version on a client stream.
    STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT (int)
    TLS 1.0 on a client stream.
    STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT (int)
    TLS 1.1 on a client stream.
    STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT (int)
    TLS 1.2 on a client stream.
    STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT (int)
    TLS 1.3 on a client stream.
    STREAM_CRYPTO_METHOD_ANY_SERVER (int)
    Any TLS or SSL version on a server stream.
    STREAM_CRYPTO_METHOD_SSLv2_SERVER (int)
    SSL 2 on a server stream.
    STREAM_CRYPTO_METHOD_SSLv3_SERVER (int)
    SSL 3 on a server stream.
    STREAM_CRYPTO_METHOD_SSLv23_SERVER (int)
    TLS 1.0, 1.1 or 1.2 on a server stream.
    STREAM_CRYPTO_METHOD_TLS_SERVER (int)
    Any TLS version on a server stream.
    STREAM_CRYPTO_METHOD_TLSv1_0_SERVER (int)
    TLS 1.0 on a server stream.
    STREAM_CRYPTO_METHOD_TLSv1_1_SERVER (int)
    TLS 1.1 on a server stream.
    STREAM_CRYPTO_METHOD_TLSv1_2_SERVER (int)
    TLS 1.2 on a server stream.
    STREAM_CRYPTO_METHOD_TLSv1_3_SERVER (int)
    TLS 1.3 on a server stream.
    STREAM_CRYPTO_PROTO_SSLv3 (int)
    Alias of STREAM_CRYPTO_METHOD_SSLv3_SERVER.
    STREAM_CRYPTO_PROTO_TLSv1_0 (int)
    Alias of STREAM_CRYPTO_METHOD_TLSv1_0_SERVER.
    STREAM_CRYPTO_PROTO_TLSv1_1 (int)
    Alias of STREAM_CRYPTO_METHOD_TLSv1_1_SERVER.
    STREAM_CRYPTO_PROTO_TLSv1_2 (int)
    Alias of STREAM_CRYPTO_METHOD_TLSv1_2_SERVER.
    STREAM_CRYPTO_PROTO_TLSv1_3 (int)
    Alias of STREAM_CRYPTO_METHOD_TLSv1_3_SERVER.
    Unused internal constants
    STREAM_MUST_SEEK (int)
    Ensure stream is seekable. This may result in a copy of the stream being created.
    STREAM_IGNORE_URL (int)
    Do not use plugin wrappers.

    Constants used with stream_socket_pair()

    Note: Not all constants might be available on a given system.

    Constants for the domain parameter
    STREAM_PF_INET (int)
    Internet Protocol Version 4 (IPv4).
    STREAM_PF_INET6 (int)
    Internet Protocol Version 6 (IPv6).
    STREAM_PF_UNIX (int)
    Unix system internal protocols.
    Constants for the type parameter
    STREAM_SOCK_DGRAM (int)
    Provides datagrams, which are connectionless messages. For example: UDP.
    STREAM_SOCK_RAW (int)
    Provides a raw socket, which provides access to internal network protocols and interfaces. Usually this type of socket is just available to the root user.
    STREAM_SOCK_RDM (int)
    Provides a RDM (Reliably-delivered messages) socket.
    STREAM_SOCK_SEQPACKET (int)
    Provides a sequenced packet stream socket.
    STREAM_SOCK_STREAM (int)
    Provides sequenced, two-way byte streams with a transmission mechanism for out-of-band data. For example: TCP.
    Constants for the protocol parameter
    STREAM_IPPROTO_ICMP (int)
    Provides a ICMP socket.
    STREAM_IPPROTO_IP (int)
    Provides a IP socket.
    STREAM_IPPROTO_RAW (int)
    Provides a RAW socket.
    STREAM_IPPROTO_TCP (int)
    Provides a TCP socket.
    STREAM_IPPROTO_UDP (int)
    Provides a UDP socket.

    Constants used with stream_notification_callback()

    Values for the notification_code parameter
    STREAM_NOTIFY_RESOLVE (int)
    A remote address required for this stream has been resolved, or the resolution failed. See severity for an indication of which happened.
    Warning

    Support for this notification code is not yet implemented.

    STREAM_NOTIFY_CONNECT (int)
    A connection with an external resource has been established.
    STREAM_NOTIFY_AUTH_REQUIRED (int)
    Additional authorization is required to access the specified resource. Typical issued with severity level of STREAM_NOTIFY_SEVERITY_ERR.
    STREAM_NOTIFY_MIME_TYPE_IS (int)
    The mime-type of resource has been identified. Refer to message for a description of the discovered type.
    STREAM_NOTIFY_FILE_SIZE_IS (int)
    The size of the resource has been discovered.
    STREAM_NOTIFY_REDIRECTED (int)
    The external resource has redirected the stream to an alternate location. Refer to message.
    STREAM_NOTIFY_PROGRESS (int)
    Indicates current progress of the stream transfer in bytes_transferred and possibly bytes_max as well.
    STREAM_NOTIFY_COMPLETED (int)
    There is no more data available on the stream. (First implemented as of PHP 8.3.0.)
    STREAM_NOTIFY_FAILURE (int)
    A generic error occurred on the stream. Refer to message and message_code for details.
    STREAM_NOTIFY_AUTH_RESULT (int)
    Authorization has been completed (with or without success).
    Values for the severity parameter
    STREAM_NOTIFY_SEVERITY_INFO (int)
    Normal, non-error related, notification.
    STREAM_NOTIFY_SEVERITY_WARN (int)
    Non critical error condition. Processing may continue.
    STREAM_NOTIFY_SEVERITY_ERR (int)
    A critical error occurred. Processing cannot continue.

    streamWrapper related constants

    Valid flags for stream_wrapper_register()
    STREAM_IS_URL (int)
    Indicates that the stream wrapper protocol is a URL protocol.
    Values for the cast_as parameter of streamWrapper::stream_cast()
    STREAM_CAST_FOR_SELECT (int)
    Indicates that streamWrapper::stream_cast() was called by streamWrapper::stream_select().
    STREAM_CAST_AS_STREAM (int)
    Indicates that streamWrapper::stream_cast() was called by any method other than streamWrapper::stream_select().
    Values for the option parameter of streamWrapper::stream_metadata()
    STREAM_META_TOUCH (int)
    Indicates a call to touch().
    STREAM_META_OWNER (int)
    Indicates a call to chown().
    STREAM_META_OWNER_NAME (int)
    Indicates a call to chown().
    STREAM_META_GROUP (int)
    Indicates a call to chgrp().
    STREAM_META_GROUP_NAME (int)
    Indicates a call to chgrp().
    STREAM_META_ACCESS (int)
    Indicates a call to chmod().
    Valid flags for streamWrapper::mkdir() and streamWrapper::rmdir()
    STREAM_MKDIR_RECURSIVE (int)
    Recursive flag for the options parameters of mkdir() and rmdir().
    Values for the options parameter of streamWrapper::stream_open()
    STREAM_USE_PATH (int)
    Flag indicating that relative paths should use the include path to locate the resource.
    STREAM_REPORT_ERRORS (int)
    Flag indicating that the stream wrapper should report errors. If the flag is not set, no errors should be reported. Errors are usually reported by the use of the trigger_error() function.
    Values for the option parameter of streamWrapper::stream_set_option()
    STREAM_OPTION_BLOCKING (int)
    Set blocking/non-blocking mode on a stream.
    STREAM_OPTION_READ_BUFFER (int)
    Set read file buffering on a stream.
    Valid option values
    STREAM_BUFFER_NONE (int)
    No buffering.
    STREAM_BUFFER_LINE (int)
    Line buffering.
    STREAM_BUFFER_FULL (int)
    Full buffering.
    STREAM_OPTION_READ_TIMEOUT (int)
    Set read file buffering on a stream.
    STREAM_OPTION_WRITE_BUFFER (int)
    Set write file buffering on a stream. See STREAM_OPTION_READ_BUFFER for valid buffer options.
    Values for the flags parameter of streamWrapper::url_stat()
    Only information about the link itself should be returned, not the resource pointed to by the link.
    STREAM_URL_STAT_QUIET (int)
    The wrapper should not raise any errors.

    php_user_filter related constants

    Valid return values for php_user_filter::filter()
    PSFS_PASS_ON (int)
    Return value indicating that the userspace filter returned buckets in $out.
    PSFS_FEED_ME (int)
    Return value indicating that the userspace filter did not return buckets in $out. (i.e. No data available.)
    PSFS_ERR_FATAL (int)
    Return value indicating that the userspace filter encountered an unrecoverable error. (i.e. Invalid data received.)
    Unused internal constants
    PSFS_FLAG_NORMAL (int)
    Regular read/write.
    PSFS_FLAG_FLUSH_INC (int)
    An incremental flush.
    PSFS_FLAG_FLUSH_CLOSE (int)
    Final flush prior to closing.

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