预定义常量

    下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

    Constant Description
    STREAM_FILTER_READ Used with stream_filter_append() and stream_filter_prepend() to indicate that the specified filter should only be applied when reading
    STREAM_FILTER_WRITE Used with stream_filter_append() and stream_filter_prepend() to indicate that the specified filter should only be applied when writing
    STREAM_FILTER_ALL This constant is equivalent to STREAM_FILTER_READ | STREAM_FILTER_WRITE
    PSFS_PASS_ON Return Code indicating that the userspace filter returned buckets in $out.
    PSFS_FEED_ME Return Code indicating that the userspace filter did not return buckets in $out (i.e. No data available).
    PSFS_ERR_FATAL Return Code indicating that the userspace filter encountered an unrecoverable error (i.e. Invalid data received).
    PSFS_FLAG_NORMAL Regular read/write.
    PSFS_FLAG_FLUSH_INC An incremental flush.
    PSFS_FLAG_FLUSH_CLOSE Final flush prior to closing.
    STREAM_USE_PATH Flag indicating if the stream used the include path.
    STREAM_REPORT_ERRORS Flag indicating if the wrapper is responsible for raising errors using trigger_error() during opening of the stream. If this flag is not set, you should not raise any errors.
    STREAM_CLIENT_ASYNC_CONNECT Open client socket asynchronously. This option must be used together with the STREAM_CLIENT_CONNECT flag. Used with stream_socket_client().
    STREAM_CLIENT_CONNECT Open client socket connection. Client sockets should always include this flag. Used with stream_socket_client().
    STREAM_CLIENT_PERSISTENT Client socket opened with stream_socket_client() should remain persistent between page loads.
    STREAM_SERVER_BIND Tells a stream created with stream_socket_server() to bind to the specified target. Server sockets should always include this flag.
    STREAM_SERVER_LISTEN Tells a stream created with stream_socket_server() and bound using the STREAM_SERVER_BIND flag to start listening on 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.
    STREAM_NOTIFY_RESOLVE A remote address required for this stream has been resolved, or the resolution failed. See severity for an indication of which happened.
    STREAM_NOTIFY_CONNECT A connection with an external resource has been established.
    STREAM_NOTIFY_AUTH_REQUIRED Additional authorization is required to access the specified resource. Typical issued with severity level of STREAM_NOTIFY_SEVERITY_ERR.
    STREAM_NOTIFY_MIME_TYPE_IS The mime-type of resource has been identified, refer to message for a description of the discovered type.
    STREAM_NOTIFY_FILE_SIZE_IS The size of the resource has been discovered.
    STREAM_NOTIFY_REDIRECTED The external resource has redirected the stream to an alternate location. Refer to message.
    STREAM_NOTIFY_PROGRESS Indicates current progress of the stream transfer in bytes_transferred and possibly bytes_max as well.
    STREAM_NOTIFY_COMPLETED There is no more data available on the stream.
    STREAM_NOTIFY_FAILURE A generic error occurred on the stream, consult message and message_code for details.
    STREAM_NOTIFY_AUTH_RESULT Authorization has been completed (with or without success).
    STREAM_NOTIFY_SEVERITY_INFO Normal, non-error related, notification.
    STREAM_NOTIFY_SEVERITY_WARN Non critical error condition. Processing may continue.
    STREAM_NOTIFY_SEVERITY_ERR A critical error occurred. Processing cannot continue.
    STREAM_IPPROTO_ICMP + Provides a ICMP socket.
    STREAM_IPPROTO_IP + Provides a IP socket.
    STREAM_IPPROTO_RAW + Provides a RAW socket.
    STREAM_IPPROTO_TCP + Provides a TCP socket.
    STREAM_IPPROTO_UDP + Provides a UDP socket.
    STREAM_PF_INET + Internet Protocol Version 4 (IPv4).
    STREAM_PF_INET6 + Internet Protocol Version 6 (IPv6).
    STREAM_PF_UNIX + Unix system internal protocols.
    STREAM_SOCK_DGRAM + Provides datagrams, which are connectionless messages (UDP, for example).
    STREAM_SOCK_RAW + 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 + Provides a RDM (Reliably-delivered messages) socket.
    STREAM_SOCK_SEQPACKET + Provides a sequenced packet stream socket.
    STREAM_SOCK_STREAM + Provides sequenced, two-way byte streams with a transmission mechanism for out-of-band data (TCP, for example).
    STREAM_SHUT_RD Used with stream_socket_shutdown() to disable further receptions.
    STREAM_SHUT_WR Used with stream_socket_shutdown() to disable further transmissions.
    STREAM_SHUT_RDWR Used with stream_socket_shutdown() to disable further receptions and transmissions.
    STREAM_CAST_FOR_SELECT Stream casting, for when stream_select() is calling stream_cast().
    STREAM_CAST_AS_STREAM Stream casting, when stream_cast() is called otherwise (see above).
    STREAM_META_TOUCH Used with stream_metadata(), to specify touch() call.
    STREAM_META_OWNER Used with stream_metadata(), to specify chown() call.
    STREAM_META_OWNER_NAME Used with stream_metadata(), to specify chown() call.
    STREAM_META_GROUP Used with stream_metadata(), to specify chgrp() call.
    STREAM_META_GROUP_NAME Used with stream_metadata(), to specify chgrp() call.
    STREAM_META_ACCESS Used with stream_metadata(), to specify chmod() call.
    STREAM_BUFFER_NONE No buffering.
    STREAM_BUFFER_LINE Line buffering.
    STREAM_BUFFER_FULL Full buffering.
    STREAM_CRYPTO_METHOD_ANY_CLIENT Any TLS or SSL version on a client stream.
    STREAM_CRYPTO_METHOD_SSLv2_CLIENT SSL 2.0 on a client stream.
    STREAM_CRYPTO_METHOD_SSLv3_CLIENT SSL 3 on a client stream.
    STREAM_CRYPTO_METHOD_SSLv23_CLIENT TLS 1.0, 1.1 or 1.2 on a client stream.
    STREAM_CRYPTO_METHOD_TLS_CLIENT Any TLS version on a client stream.
    STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT TLS 1.0 on a client stream.
    STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT TLS 1.1 on a client stream.
    STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT TLS 1.2 on a client stream.
    STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT TLS 1.3 on a client stream.
    STREAM_CRYPTO_METHOD_ANY_SERVER Any TLS or SSL version on a server stream.
    STREAM_CRYPTO_METHOD_SSLv2_SERVER SSL 2 on a server stream.
    STREAM_CRYPTO_METHOD_SSLv3_SERVER SSL 3 on a server stream.
    STREAM_CRYPTO_METHOD_SSLv23_SERVER TLS 1.0, 1.1 or 1.2 on a server stream.
    STREAM_CRYPTO_METHOD_TLS_SERVER Any TLS version on a server stream.
    STREAM_CRYPTO_METHOD_TLSv1_0_SERVER TLS 1.0 on a server stream.
    STREAM_CRYPTO_METHOD_TLSv1_1_SERVER TLS 1.1 on a server stream.
    STREAM_CRYPTO_METHOD_TLSv1_2_SERVER TLS 1.2 on a server stream.
    STREAM_CRYPTO_METHOD_TLSv1_3_SERVER TLS 1.3 on a server stream.
    STREAM_CRYPTO_PROTO_SSLv3 别名 STREAM_CRYPTO_METHOD_SSLv3_SERVER.
    STREAM_CRYPTO_PROTO_TLSv1_0 别名 STREAM_CRYPTO_METHOD_TLSv1_0_SERVER.
    STREAM_CRYPTO_PROTO_TLSv1_1 别名 STREAM_CRYPTO_METHOD_TLSv1_1_SERVER.
    STREAM_CRYPTO_PROTO_TLSv1_2 别名 STREAM_CRYPTO_METHOD_TLSv1_2_SERVER.
    STREAM_CRYPTO_PROTO_TLSv1_3 别名 STREAM_CRYPTO_METHOD_TLSv1_3_SERVER.
    STREAM_IGNORE_URL Do not use plugin wrappers.
    STREAM_MUST_SEEK Ensure stream is seekable. This may result in a copy of the stream being created.
    STREAM_MKDIR_RECURSIVE Recursive flag for the options parameters of mkdir() and rmdir().
    STREAM_IS_URL Indicates that the stream is a URL.
    STREAM_URL_STAT_QUIET The wrapper should not raise any errors.
    STREAM_PEEK Retrieve data from the socket, but do not consume the buffer. Subsequent calls to fread() or stream_socket_recvfrom() will see the same data.
    STREAM_OOB Process OOB (out-of-band) data.
    STREAM_OPTION_BLOCKING Set blocking/non-blocking mode on a stream.
    STREAM_OPTION_READ_TIMEOUT Set read file buffering on a stream.
    STREAM_OPTION_WRITE_BUFFER Set write file buffering on a stream.
    STREAM_OPTION_READ_BUFFER Set read file buffering on a stream.

    注意: The constants marked with + are meant to be used with stream_socket_pair(). Please note that some of these constants might not be available in your system.

    注意: The STREAM_META_* constants are meant to be used with stream_metadata().

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