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

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

<HTML
><HEAD
><TITLE
>preg_replace</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="Regular Expression Functions (Perl-Compatible)"
HREF="ref.pcre.html"><LINK
REL="PREVIOUS"
TITLE="preg_replace_callback"
HREF="function.preg-replace-callback.html"><LINK
REL="NEXT"
TITLE="preg_split"
HREF="function.preg-split.html"><META
HTTP-EQUIV="Content-type"
CONTENT="text/html; charset=ISO-8859-1"></HEAD
><BODY
CLASS="refentry"
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="function.preg-replace-callback.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="function.preg-split.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="function.preg-replace"
></A
>preg_replace</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN81662"
></A
><P
>    (PHP 3&#62;= 3.0.9, PHP 4 )</P
>preg_replace&nbsp;--&nbsp;Perform a regular expression search and replace</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN81665"
></A
><H2
>Description</H2
>mixed <B
CLASS="methodname"
>preg_replace</B
> ( mixed pattern, mixed replacement, mixed subject [, int limit])<BR
></BR
><P
>&#13;     Searches <TT
CLASS="parameter"
><I
>subject</I
></TT
> for matches to
     <TT
CLASS="parameter"
><I
> pattern</I
></TT
> and replaces them with
     <TT
CLASS="parameter"
><I
>replacement</I
></TT
>. If
     <TT
CLASS="parameter"
><I
>limit</I
></TT
> is specified, then only
     <TT
CLASS="parameter"
><I
>limit</I
></TT
> matches will be replaced; if
     <TT
CLASS="parameter"
><I
>limit</I
></TT
> is omitted or is -1, then all
     matches are replaced.
    </P
><P
>&#13;     <TT
CLASS="parameter"
><I
>Replacement</I
></TT
> may contain references of the form
     <TT
CLASS="literal"
>\\<TT
CLASS="replaceable"
><I
>n</I
></TT
></TT
> or (since PHP 4.0.4)
     <TT
CLASS="literal"
><TT
CLASS="replaceable"
><I
>$n</I
></TT
></TT
>, with the latter form
     being the preferred one. Every such reference will be replaced by the text
     captured by the <TT
CLASS="replaceable"
><I
>n</I
></TT
>'th parenthesized pattern.
     <TT
CLASS="replaceable"
><I
>n </I
></TT
>can be from 0 to 99, and
     <TT
CLASS="literal"
>\\0</TT
> or <TT
CLASS="literal"
>$0</TT
> refers to the text matched
     by the whole pattern. Opening parentheses are counted from left to right
     (starting from 1) to obtain the number of the capturing subpattern.
     <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
       When working with a replacement pattern where a backreference is immediately
       followed by another number (i.e.: placing a literal number immediately
       after a matched pattern), you cannot use the familiar <TT
CLASS="literal"
>\\1</TT
>
       notation for your backreference.  <TT
CLASS="literal"
>\\11</TT
>, for example,
       would confuse <B
CLASS="function"
>preg_replace()</B
> since it does not know whether
       you want the <TT
CLASS="literal"
>\\1</TT
> backreference followed by a literal <TT
CLASS="literal"
>1</TT
>, 
       or the <TT
CLASS="literal"
>\\11</TT
> backreference followed by nothing.  In this case
       the solution is to use <TT
CLASS="literal"
>\${1}1</TT
>.  This creates an
       isolated <TT
CLASS="literal"
>$1</TT
> backreference, leaving the <TT
CLASS="literal"
>1</TT
>
       as a literal.
      </P
></BLOCKQUOTE
></DIV
>
     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN81710"
></A
><P
><B
>Example 1. Using backreferences followed by numeric literals.</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>&#60;?php
$str = "April 15, 2003";
$pattern = "/(\w+) (\d+), (\d+)/i";
$replacement = "\${1}1,\$3";
print preg_replace($pattern, $replacement, $string);

/* Output
   ======

April1,2003

 */
?&#62;</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><P
>&#13;     If matches are found, the new <TT
CLASS="parameter"
><I
>subject</I
></TT
> will
     be returned, otherwise <TT
CLASS="parameter"
><I
>subject</I
></TT
> will be
     returned unchanged.
    </P
><P
>&#13;     Every parameter to <B
CLASS="function"
>preg_replace()</B
> (except
     <TT
CLASS="parameter"
><I
>limit</I
></TT
>) can be an array.
    </P
><P
>&#13;     <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
       When using arrays with <TT
CLASS="parameter"
><I
>pattern</I
></TT
> and
       <TT
CLASS="parameter"
><I
>replacement</I
></TT
>, the keys are processed
       in the order they appear in the array.  This is 
       <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>not necessarily</I
></SPAN
> the same as the numerical
       index order.  If you use indexes to identify which 
       <TT
CLASS="parameter"
><I
>pattern</I
></TT
> should be replaced by which
       <TT
CLASS="parameter"
><I
>replacement</I
></TT
>, you should perform a
       <A
HREF="function.ksort.html"
><B
CLASS="function"
>ksort()</B
></A
> on each array prior to calling
       <B
CLASS="function"
>preg_replace()</B
>.
      </P
></BLOCKQUOTE
></DIV
>
     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN81729"
></A
><P
><B
>Example 2. Using indexed arrays with <B
CLASS="function"
>preg_replace()</B
></B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>&#60;?php
$string = "The quick brown fox jumped over the lazy dog.";

$patterns[0] = "/quick/";
$patterns[1] = "/brown/";
$patterns[2] = "/fox/";

$replacements[2] = "bear";
$replacements[1] = "black";
$replacements[0] = "slow";

print preg_replace($patterns, $replacements, $string);

/* Output
   ======

The bear black slow jumped over the lazy dog.

*/

/* By ksorting patterns and replacements,
   we should get what we wanted. */

ksort($patterns);
ksort($replacements);

print preg_replace($patterns, $replacements, $string);

/* Output
   ======

The slow black bear jumped over the lazy dog.

*/

?&#62;</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><P
>&#13;     If <TT
CLASS="parameter"
><I
>subject</I
></TT
> is an array, then the search
     and replace is performed on every entry of
     <TT
CLASS="parameter"
><I
>subject</I
></TT
>, and the return value is an array
     as well.
    </P
><P
>&#13;     If <TT
CLASS="parameter"
><I
>pattern</I
></TT
> and
     <TT
CLASS="parameter"
><I
>replacement</I
></TT
> are arrays, then
     <B
CLASS="function"
>preg_replace()</B
> takes a value from each array
     and uses them to do search and replace on
     <TT
CLASS="parameter"
><I
>subject</I
></TT
>.  If
     <TT
CLASS="parameter"
><I
>replacement</I
></TT
> has fewer values than
     <TT
CLASS="parameter"
><I
>pattern</I
></TT
>, then empty string is used for the
     rest of replacement values.  If <TT
CLASS="parameter"
><I
>pattern </I
></TT
>
     is an array and <TT
CLASS="parameter"
><I
>replacement</I
></TT
> is a string,
     then this replacement string is used for every value of
     <TT
CLASS="parameter"
><I
>pattern</I
></TT
>.  The converse would not make
     sense, though.
    </P
><P
>&#13;     <TT
CLASS="literal"
>/e</TT
> modifier makes
     <B
CLASS="function"
>preg_replace()</B
> treat the
     <TT
CLASS="parameter"
><I
>replacement</I
></TT
> parameter as PHP code after
     the appropriate references substitution is done. Tip: make sure
     that <TT
CLASS="parameter"
><I
>replacement</I
></TT
> constitutes a valid PHP
     code string, otherwise PHP will complain about a parse error at
     the line containing <B
CLASS="function"
>preg_replace()</B
>.
    </P
><P
>&#13;     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN81753"
></A
><P
><B
>Example 3. Replacing several values</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="programlisting"
>$patterns = array ("/(19|20)(\d{2})-(\d{1,2})-(\d{1,2})/",
                   "/^\s*{(\w+)}\s*=/");
$replace = array ("\\3/\\4/\\1\\2", "$\\1 =");
print preg_replace ($patterns, $replace, "{startDate} = 1999-5-27");</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
     This example will produce:
     <TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="programlisting"
>$startDate = 5/27/1999</PRE
></TD
></TR
></TABLE
>
     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN81757"
></A
><P
><B
>Example 4. Using /e modifier</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>preg_replace ("/(&#60;\/?)(\w+)([^&#62;]*&#62;)/e", 
              "'\\1'.strtoupper('\\2').'\\3'", 
              $html_body);</PRE
></TD
></TR
></TABLE
><P
>&#13;       This would capitalize all HTML tags in the input text.
      </P
></DIV
></TD
></TR
></TABLE
>
     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN81761"
></A
><P
><B
>Example 5. Convert HTML to text</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>// $document should contain an HTML document.
// This will remove HTML tags, javascript sections
// and white space. It will also convert some
// common HTML entities to their text equivalent.

$search = array ("'&#60;script[^&#62;]*?&#62;.*?&#60;/script&#62;'si",  // Strip out javascript
                 "'&#60;[\/\!]*?[^&#60;&#62;]*?&#62;'si",           // Strip out html tags
                 "'([\r\n])[\s]+'",                 // Strip out white space
                 "'&#38;(quot|#34);'i",                 // Replace html entities
                 "'&#38;(amp|#38);'i",
                 "'&#38;(lt|#60);'i",
                 "'&#38;(gt|#62);'i",
                 "'&#38;(nbsp|#160);'i",
                 "'&#38;(iexcl|#161);'i",
                 "'&#38;(cent|#162);'i",
                 "'&#38;(pound|#163);'i",
                 "'&#38;(copy|#169);'i",
                 "'&#38;#(\d+);'e");                    // evaluate as php

$replace = array ("",
                  "",
                  "\\1",
                  "\"",
                  "&#38;",
                  "&#60;",
                  "&#62;",
                  " ",
                  chr(161),
                  chr(162),
                  chr(163),
                  chr(169),
                  "chr(\\1)");

$text = preg_replace ($search, $replace, $document);</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      Parameter <TT
CLASS="parameter"
><I
>limit</I
></TT
> was added after PHP 4.0.1pl2.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     See also <A
HREF="function.preg-match.html"
><B
CLASS="function"
>preg_match()</B
></A
>,
     <A
HREF="function.preg-match-all.html"
><B
CLASS="function"
>preg_match_all()</B
></A
>, and
     <A
HREF="function.preg-split.html"
><B
CLASS="function"
>preg_split()</B
></A
>.
    </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="function.preg-replace-callback.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="function.preg-split.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>preg_replace_callback</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="ref.pcre.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>preg_split</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>