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Document the stream notification parameter
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@257436 c90b9560-bf6c-de11-be94-00142212c4b1
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Hannes Magnusson
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2 changed files with 216 additions and 33 deletions
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.2 $ -->
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<!-- $Revision: 1.3 $ -->
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<chapter xml:id="stream.contexts">
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<chapter xml:id="stream.contexts" xmlns="http://docbook.org/ns/docbook">
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<title>Stream Contexts</title>
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<simpara>
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A <literal>context</literal> is a set of <literal>parameters</literal> and
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@ -15,39 +15,13 @@
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<literal>Options</literal> can be specified when calling
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<function>stream_context_create</function>, or later using
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<function>stream_context_set_option</function>.
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A list of wrapper specific <literal>options</literal> can be found with
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the list of built-in wrappers (See <xref linkend="wrappers"/>).
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A list of wrapper specific <literal>options</literal> can be found in the
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<xref linkend="context" /> chapter.
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</simpara>
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<simpara>
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In addition, <literal>parameters</literal> may be set on a <literal>context</literal>
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using <function>stream_context_set_params</function>. Currently the only
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<literal>context parameter</literal> supported by PHP is
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<literal>notification</literal>. The value of this parameter must be the
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name of a function to be called when an event occurs on a stream.
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The notification function called during an event should accept the following
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six parameters:
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</simpara>
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<methodsynopsis>
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<type>void</type><methodname>my_notifier</methodname>
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<methodparam><type>int</type><parameter>notification_code</parameter></methodparam>
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<methodparam><type>int</type><parameter>severity</parameter></methodparam>
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<methodparam><type>string</type><parameter>message</parameter></methodparam>
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<methodparam><type>int</type><parameter>message_code</parameter></methodparam>
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<methodparam><type>int</type><parameter>bytes_transferred</parameter></methodparam>
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<methodparam><type>int</type><parameter>bytes_max</parameter></methodparam>
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</methodsynopsis>
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<simpara>
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<parameter>notification_code</parameter> and <parameter>severity</parameter>
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are numerical values which correspond to the <constant>STREAM_NOTIFY_*</constant>
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constants listed below.
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If a descriptive message is available from the stream, <parameter>message</parameter>
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and <parameter>message_code</parameter> will be populated with the appropriate values.
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The meaning of these values is dependent on the specific wrapper in use.
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<parameter>bytes_transferred</parameter> and <parameter>bytes_max</parameter> will
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be populated when applicable.
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<literal>Parameters</literal> can be specified for
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<literal>contexts</literal> using the
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<function>stream_context_set_params</function> function.
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</simpara>
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</chapter>
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209
reference/stream/functions/stream-notification-callback.xml
Normal file
209
reference/stream/functions/stream-notification-callback.xml
Normal file
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@ -0,0 +1,209 @@
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<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision: 1.1 $ -->
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<refentry xml:id="function.stream-notification-callback" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<refnamediv>
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<refname>stream_notification_callback</refname>
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<refpurpose>A callback function for the <literal>notification</literal> context paramater</refpurpose>
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</refnamediv>
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<refsect1 role="description"><!-- {{{ -->
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&reftitle.description;
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<methodsynopsis>
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<type>void</type><methodname>stream_notification_callback</methodname>
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<methodparam><type>int</type><parameter>notification_code</parameter></methodparam>
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<methodparam><type>int</type><parameter>severity</parameter></methodparam>
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<methodparam><type>string</type><parameter>message</parameter></methodparam>
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<methodparam><type>int</type><parameter>message_code</parameter></methodparam>
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<methodparam><type>int</type><parameter>bytes_transferred</parameter></methodparam>
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<methodparam><type>int</type><parameter>bytes_max</parameter></methodparam>
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</methodsynopsis>
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<para>
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A <type>callback</type> function called during an event.
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</para>
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<note>
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<para>
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This is note a real function, only a prototype of how the function should
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be.
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</para>
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</note>
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</refsect1><!-- }}} -->
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<refsect1 role="parameters"><!-- {{{ -->
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>notification_code</parameter></term>
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<listitem>
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<para>
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One of the <constant>STREAM_NOTIFY_*</constant> notification constants.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>severity</parameter></term>
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<listitem>
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<para>
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One of the <constant>STREAM_NOTIFY_SEVERITY_*</constant> notification constants.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>message</parameter></term>
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<listitem>
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<para>
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Passed if a descriptive message is available for the event.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>message_code</parameter></term>
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<listitem>
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<para>
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Passed if a descriptive message code is available for the event.
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</para>
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<para>
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The meaning of this value is dependent on the specific wrapper in use.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>bytes_transferred</parameter></term>
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<listitem>
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<para>
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If applicable, the <parameter>bytes_transferred</parameter> will be
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populated.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>bytes_max</parameter></term>
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<listitem>
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<para>
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If applicable, the <parameter>bytes_transferred</parameter> will be
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populated.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1><!-- }}} -->
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<refsect1 role="returnvalues"><!-- {{{ -->
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&reftitle.returnvalues;
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<para>
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&return.void;
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</para>
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</refsect1><!-- }}} -->
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<refsect1 role="examples"><!-- {{{ -->
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&reftitle.examples;
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<para>
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<example xml:id="stream-notification-callback.example.basic"><!-- {{{ -->
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<title><function>stream_notification_callback</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function stream_notification_callback($notification_code, $severity, $message, $message_code, $bytes_transferred, $bytes_max) {
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switch($notification_code) {
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case STREAM_NOTIFY_RESOLVE:
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case STREAM_NOTIFY_AUTH_REQUIRED:
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case STREAM_NOTIFY_COMPLETED:
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case STREAM_NOTIFY_FAILURE:
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case STREAM_NOTIFY_AUTH_RESULT:
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var_dump($notification_code, $severity, $message, $message_code, $bytes_transferred, $bytes_max);
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/* Ignore */
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break;
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case STREAM_NOTIFY_REDIRECTED:
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echo "Being redirected to: ", $message;
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break;
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case STREAM_NOTIFY_CONNECT:
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echo "Conntected...";
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break;
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case STREAM_NOTIFY_FILE_SIZE_IS:
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echo "Got the filesize: ", $bytes_max;
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break;
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case STREAM_NOTIFY_MIME_TYPE_IS:
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echo "Found the mime-type: ", $message;
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break;
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case STREAM_NOTIFY_PROGRESS:
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echo "Made some progress, downloaded ", $bytes_transferred, " so far";
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break;
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}
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echo "\n";
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}
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$ctx = stream_context_create(null, array("notification" => "stream_notification_callback"));
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file_get_contents("http://php.net/contact", false, $ctx);
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?>
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]]>
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</programlisting>
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&example.outputs.similar;
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<screen>
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<![CDATA[
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Conntected...
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Found the mime-type: text/html; charset=utf-8
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Being redirected to: http://no.php.net/contact
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Conntected...
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Got the filesize: 0
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Found the mime-type: text/html; charset=utf-8
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Being redirected to: http://no.php.net/contact.php
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Conntected...
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Got the filesize: 4589
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Found the mime-type: text/html;charset=utf-8
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Made some progress, downloaded 0 so far
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Made some progress, downloaded 0 so far
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Made some progress, downloaded 0 so far
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Made some progress, downloaded 1440 so far
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Made some progress, downloaded 2880 so far
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Made some progress, downloaded 4320 so far
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Made some progress, downloaded 5760 so far
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Made some progress, downloaded 6381 so far
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Made some progress, downloaded 7002 so far
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]]>
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</screen>
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</example><!-- }}} -->
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</para>
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</refsect1><!-- }}} -->
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<refsect1 role="seealso"><!-- {{{ -->
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><xref linkend="context.params" /></member>
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</simplelist>
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</para>
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</refsect1><!-- }}} -->
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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