Sophie: php-manual-en-4.3.0-2mdk noarch

php-manual-en-4.3.0-2mdk.noarch.rpm

<HTML
><HEAD
><TITLE
>Error Control Operators</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
REL="HOME"
TITLE="PHP Manual"
HREF="index.html"><LINK
REL="UP"
TITLE="Operators"
HREF="language.operators.html"><LINK
REL="PREVIOUS"
TITLE="Comparison Operators"
HREF="language.operators.comparison.html"><LINK
REL="NEXT"
TITLE="Execution Operators"
HREF="language.operators.execution.html"><META
HTTP-EQUIV="Content-type"
CONTENT="text/html; charset=ISO-8859-1"></HEAD
><BODY
CLASS="sect1"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>PHP Manual</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="language.operators.comparison.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Chapter 11. Operators</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="language.operators.execution.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="language.operators.errorcontrol"
></A
>Error Control Operators</H1
><P
>&#13;    PHP supports one error control operator: the at sign (@). When
    prepended to an expression in PHP, any error messages that might
    be generated by that expression will be ignored.
   </P
><P
>&#13;    If the <A
HREF="ref.errorfunc.html#ini.track-errors"
>track_errors</A
>
    feature is enabled, any error message generated by the expression
    will be saved in the variable
    <A
HREF="reserved.variables.html#reserved.variables.phperrormsg"
>$php_errormsg</A
>.
    This variable will be overwritten on each error, so check early if you
    want to use it.
   </P
><P
>&#13;    <DIV
CLASS="informalexample"
><A
NAME="AEN4628"
></A
><P
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>&#60;?php
/* Intentional file error */
$my_file = @file ('non_existent_file') or
    die ("Failed opening file: error was '$php_errormsg'");

// this works for any expression, not just functions:
$value = @$cache[$key]; 
// will not issue a notice if the index $key doesn't exist.

?&#62;</PRE
></TD
></TR
></TABLE
><P
></P
></DIV
>
   </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
     The @-operator works only on
     <A
HREF="language.expressions.html"
>expressions</A
>. A simple rule
     of thumb is: if you can take the value of something, you can prepend
     the @ operator to it. For instance, you can prepend it to variables,
     function and <A
HREF="function.include.html"
><B
CLASS="function"
>include()</B
></A
> calls, constants, and
     so forth. You cannot prepend it to function or class definitions,
     or conditional structures such as <TT
CLASS="literal"
>if</TT
> and
     <TT
CLASS="literal"
>foreach</TT
>, and so forth.
    </P
></BLOCKQUOTE
></DIV
><P
>&#13;    See also <A
HREF="function.error-reporting.html"
><B
CLASS="function"
>error_reporting()</B
></A
>.
   </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
     The "@" error-control operator prefix will not disable messages
     that are the result of parse errors.
    </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="warning"
><P
></P
><TABLE
CLASS="warning"
BORDER="1"
WIDTH="100%"
><TR
><TD
ALIGN="CENTER"
><B
>Warning</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
>&#13;     Currently the "@" error-control operator prefix will even disable
     error reporting for critical errors that will terminate script
     execution. Among other things, this means that if you use "@" to
     suppress errors from a certain function and either it isn't
     available or has been mistyped, the script will die right there
     with no indication as to why.
    </P
></TD
></TR
></TABLE
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="language.operators.comparison.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="language.operators.execution.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Comparison Operators</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="language.operators.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Execution Operators</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>