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<HTML
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>error_log</TITLE
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TITLE="Error Handling and Logging Functions"
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><H1
><A
NAME="function.error-log"
>error_log</A
></H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN10223"
></A
><P
>    (PHP3 , PHP4 )</P
>error_log&nbsp;--&nbsp;send an error message somewhere</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN10226"
></A
><H2
>Description</H2
><DIV
CLASS="funcsynopsis"
><A
NAME="AEN10228"
></A
><P
></P
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="function"
>error_log</B
></CODE
> (string message, int message_type [, string 
       destination [, string 
       extra_headers]])</CODE
></P
><P
></P
></DIV
><P
>&#13;     Sends an error message to the web server's error log, a
     <SPAN
CLASS="acronym"
>TCP</SPAN
> port or to a file.  The first parameter,
     <TT
CLASS="parameter"
><I
>message</I
></TT
>, is the error message that should
     be logged.  The second parameter,
     <TT
CLASS="parameter"
><I
>message_type</I
></TT
> says where the message should
     go:
     <DIV
CLASS="table"
><A
NAME="AEN10246"
></A
><P
><B
>Table 1. <B
CLASS="function"
>error_log()</B
> log types</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>0</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>&#13;      <TT
CLASS="parameter"
><I
>message</I
></TT
> is sent to PHP's system
      logger, using the Operating System's system logging
      mechanism or a file, depending on what the <A
HREF="configuration.html#ini.error-log"
>error_log</A
> configuration
      directive is set to.
     </TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>1</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>&#13;      <TT
CLASS="parameter"
><I
>message</I
></TT
> is sent by email to the
      address in the <TT
CLASS="parameter"
><I
>destination</I
></TT
> parameter.
      This is the only message type where the fourth parameter,
      <TT
CLASS="parameter"
><I
>extra_headers</I
></TT
> is used.  This message
      type uses the same internal function as
      <B
CLASS="function"
>Mail()</B
> does.
     </TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>2</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>&#13;      <TT
CLASS="parameter"
><I
>message</I
></TT
> is sent through the PHP debugging
      connection.  This option is only available if <A
HREF="install.configure.html#install.configure.enable-debugger"
>remote debugging has
      been enabled</A
>.  In this case, the
      <TT
CLASS="parameter"
><I
>destination</I
></TT
> parameter specifies the host
      name or IP address and optionally, port number, of the socket
      receiving the debug information.
     </TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>3</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>&#13;      <TT
CLASS="parameter"
><I
>message</I
></TT
> is appended to the file
      <TT
CLASS="parameter"
><I
>destination</I
></TT
>.
     </TD
></TR
></TBODY
></TABLE
></DIV
>
    </P
><P
>&#13;     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN10275"
></A
><P
><B
>Example 1. <B
CLASS="function"
>error_log()</B
> examples</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>&#13;// 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@mydomain.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");
      </PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
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>
    </P
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