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

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

<HTML
><HEAD
><TITLE
>Assuring Write Safety for Other Parameters</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="Accepting Arguments"
HREF="zend.arguments.html"><LINK
REL="PREVIOUS"
TITLE="Dealing with Arguments Passed by Reference"
HREF="zend.arguments.by-reference.html"><LINK
REL="NEXT"
TITLE="Creating Variables"
HREF="zend.variables.html"><META
HTTP-EQUIV="Content-type"
CONTENT="text/html; charset=ISO-8859-1"></HEAD
><BODY
CLASS="section"
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="zend.arguments.by-reference.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Chapter 32. Accepting Arguments</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="zend.variables.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="zend.arguments.write-safety"
></A
>Assuring Write Safety for Other Parameters</H1
><P
>&#13;    You might run into a situation in which you need write access to a
    parameter that's retrieved with <B
CLASS="function"
>zend_get_parameters_ex()</B
> 
    but not passed by reference. For this case, you can use the macro
    <TT
CLASS="literal"
>SEPARATE_ZVAL</TT
>, which does a zval separation on the provided
    container. The newly generated <TT
CLASS="envar"
>zval</TT
> is detached from internal
    data and has only a local scope, meaning that it can be changed or destroyed
    without implying global changes in the script context:
    <TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="programlisting"
>zval **parameter;
     
/* retrieve parameter */
zend_get_parameters_ex(1, &#38;parameter);

/* at this stage, &#60;parameter&#62; still is connected */
/* to Zend's internal data buffers */

/* make &#60;parameter&#62; write-safe */
SEPARATE_ZVAL(parameter);

/* now we can safely modify &#60;parameter&#62; */
/* without implying global changes */</PRE
></TD
></TR
></TABLE
>
    <TT
CLASS="literal"
>SEPARATE_ZVAL</TT
> uses <B
CLASS="function"
>emalloc()</B
>
    to allocate the new <TT
CLASS="envar"
>zval</TT
> container, which means that even if you
    don't deallocate this memory yourself, it will be destroyed automatically upon
    script termination. However, doing a lot of calls to this macro
    without freeing the resulting containers will clutter up your RAM.
   </P
><P
>&#13;    <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>Note:</I
></SPAN
> As you can easily work around the lack
    of write access in the "traditional" API (with
    <B
CLASS="function"
>zend_get_parameters()</B
> and so on), this API
    seems to be obsolete, and is not discussed further in this
    chapter.
   </P
></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="zend.arguments.by-reference.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="zend.variables.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Dealing with Arguments Passed by Reference</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="zend.arguments.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Creating Variables</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>