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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.12 $ -->
<!-- splitted from ./en/functions/errorfunc.xml, last change in rev 1.1 -->
<refentry id="function.error-log">
<refnamediv>
<refname>error_log</refname>
<refpurpose>Send an error message somewhere</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>error_log</methodname>
<methodparam><type>string</type><parameter>message</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>message_type</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>destination</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>extra_headers</parameter></methodparam>
</methodsynopsis>
<para>
Sends an error message to the web server's error log, a
<acronym>TCP</acronym> port or to a file.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>message</parameter></term>
<listitem>
<para>
The error message that should be logged.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>message_type</parameter></term>
<listitem>
<para>
Says where the error should go. The possible message types are as
follows:
</para>
<para>
<table>
<title><function>error_log</function> log types</title>
<tgroup cols="2">
<tbody>
<row>
<entry>0</entry>
<entry>
<parameter>message</parameter> is sent to PHP's system logger, using
the Operating System's system logging mechanism or a file, depending
on what the <link linkend="ini.error-log">error_log</link>
configuration directive is set to. This is the default option.
</entry>
</row>
<row>
<entry>1</entry>
<entry>
<parameter>message</parameter> is sent by email to the address in
the <parameter>destination</parameter> parameter. This is the only
message type where the fourth parameter,
<parameter>extra_headers</parameter> is used.
</entry>
</row>
<row>
<entry>2</entry>
<entry>
<parameter>message</parameter> is sent through the PHP debugging
connection. This option is only available if <link
linkend="configure.enable-debugger">remote debugging has
been enabled</link>. In this case, the
<parameter>destination</parameter> parameter specifies the host name
or IP address and optionally, port number, of the socket receiving
the debug information. This option is only available in PHP 3.
</entry>
</row>
<row>
<entry>3</entry>
<entry>
<parameter>message</parameter> is appended to the file
<parameter>destination</parameter>. A newline is not automatically
added to the end of the <parameter>message</parameter> string.
</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>destination</parameter></term>
<listitem>
<para>
The destination. Its meaning depends on the
<parameter>message</parameter> parameter as described above.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>extra_headers</parameter></term>
<listitem>
<para>
The extra headers. It's used when the <parameter>message</parameter>
parameter is set to <literal>1</literal>.
This message type uses the same internal function as
<function>mail</function> does.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example role="php">
<title><function>error_log</function> examples</title>
<programlisting role="php">
<![CDATA[
<?php
// Send notification through the server log if we can not
// connect to the database.
if (!Ora_Logon($username, $password)) {
error_log("Oracle database not available!", 0);
}
// Notify administrator by email if we run out of FOO
if (!($foo = allocate_new_foo())) {
error_log("Big trouble, we're all out of FOOs!", 1,
"operator@example.com");
}
// other ways of calling error_log():
error_log("You messed up!", 2, "127.0.0.1:7000");
error_log("You messed up!", 2, "loghost");
error_log("You messed up!", 3, "/var/tmp/my-errors.log");
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
</refentry>
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