Sophie: php-manual-pt_BR-5.2.4-1mdv2008.1 noarch

php-manual-pt_BR-5.2.4-1mdv2008.1.noarch.rpm

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><H1
><A
NAME="function.preg-replace"
></A
>preg_replace</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN167304"
></A
><P
>    (PHP 3 &#62;= 3.0.9, PHP 4, PHP 5)</P
>preg_replace&nbsp;--&nbsp;Perform a regular expression search and replace</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN167307"
></A
><H2
>Descrição</H2
>mixed <B
CLASS="methodname"
>preg_replace</B
> ( mixed pattern, mixed replacement, mixed subject [, int limit [, int &#38;count]] )<BR
></BR
><P
>&#13;   Searches <CODE
CLASS="parameter"
>subject</CODE
> for matches to
   <CODE
CLASS="parameter"
>pattern</CODE
> and replaces them with
   <CODE
CLASS="parameter"
>replacement</CODE
>.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN167331"
></A
><H2
>Parâmetros</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>pattern</CODE
></DT
><DD
><P
>&#13;       The pattern to search for. It can be either a string or an array with
       strings.
      </P
><P
>&#13;       The <TT
CLASS="literal"
>e</TT
> modifier makes <B
CLASS="function"
>preg_replace()</B
>
       treat the <CODE
CLASS="parameter"
>replacement</CODE
> parameter as PHP code after
       the appropriate references substitution is done. Tip: make sure that
       <CODE
CLASS="parameter"
>replacement</CODE
> 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
></DD
><DT
><CODE
CLASS="parameter"
>replacement</CODE
></DT
><DD
><P
>&#13;       The string or an array with strings to replace. If this parameter is a
       string and the <CODE
CLASS="parameter"
>pattern</CODE
> parameter is an array,
       all patterns will be replaced by that string. If both
       <CODE
CLASS="parameter"
>pattern</CODE
> and <CODE
CLASS="parameter"
>replacement</CODE
>
       parameters are arrays, each <CODE
CLASS="parameter"
>pattern</CODE
> will be
       replaced by the <CODE
CLASS="parameter"
>replacement</CODE
> counterpart. If
       there are fewer elements in the <CODE
CLASS="parameter"
>replacement</CODE
>
       array than in the <CODE
CLASS="parameter"
>pattern</CODE
> array, any extra
       <CODE
CLASS="parameter"
>pattern</CODE
>s will be replaced by an empty string.
      </P
><P
>&#13;       <CODE
CLASS="parameter"
>replacement</CODE
> 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.
      </P
><P
>&#13;       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
><P
>&#13;       When using the <TT
CLASS="literal"
>e</TT
> modifier, this function escapes
       some characters (namely <TT
CLASS="literal"
>'</TT
>, <TT
CLASS="literal"
>"</TT
>,
       <TT
CLASS="literal"
>\</TT
> and NULL) in the strings that replace the
       backreferences. This is done to ensure that no syntax errors arise
       from backreference usage with either single or double quotes (e.g.
       <TT
CLASS="literal"
>'strlen(\'$1\')+strlen("$2")'</TT
>). Make sure you are
       aware of PHP's <A
HREF="language.types.string.html"
>string
       syntax</A
> to know exactly how the interpreted string will look
       like.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>subject</CODE
></DT
><DD
><P
>&#13;       The string or an array with strings to search and replace.
      </P
><P
>&#13;       If <CODE
CLASS="parameter"
>subject</CODE
> is an array, then the search and
       replace is performed on every entry of <CODE
CLASS="parameter"
>subject</CODE
>,
       and the return value is an array as well.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>limit</CODE
></DT
><DD
><P
>&#13;       The maximum possible replacements for each pattern in each
       <CODE
CLASS="parameter"
>subject</CODE
> string. Defaults to
       <TT
CLASS="literal"
>-1</TT
> (no limit).
      </P
></DD
><DT
><CODE
CLASS="parameter"
>count</CODE
></DT
><DD
><P
>&#13;       If specified, this variable will be filled with the number of
       replacements done.
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN167406"
></A
><H2
>Valores de retornado</H2
><P
>&#13;   <B
CLASS="function"
>preg_replace()</B
> returns an array if the
   <CODE
CLASS="parameter"
>subject</CODE
> parameter is an array, or a string
   otherwise.
  </P
><P
>&#13;   If matches are found, the new <CODE
CLASS="parameter"
>subject</CODE
> will
   be returned, otherwise <CODE
CLASS="parameter"
>subject</CODE
> will be
   returned unchanged.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN167414"
></A
><H2
>Histórico</H2
><P
>&#13;   <DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN167417"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Versão</TH
><TH
>Descrição</TH
></TR
></THEAD
><TBODY
><TR
><TD
>5.1.0</TD
><TD
>&#13;        Added the <CODE
CLASS="parameter"
>count</CODE
> parameter
       </TD
></TR
><TR
><TD
>4.0.4</TD
><TD
>&#13;        Added the '$n' form for the <CODE
CLASS="parameter"
>replacement</CODE
> parameter
       </TD
></TR
><TR
><TD
>4.0.1</TD
><TD
>&#13;        Added the <CODE
CLASS="parameter"
>limit</CODE
> parameter
       </TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN167436"
></A
><H2
>Exemplos</H2
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN167439"
></A
><P
><B
>Exemplo 1. Using backreferences followed by numeric literals</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$string </font><font color="#007700">= </font><font color="#DD0000">'April 15, 2003'</font><font color="#007700">;<br /></font><font color="#0000BB">$pattern </font><font color="#007700">= </font><font color="#DD0000">'/(\w+) (\d+), (\d+)/i'</font><font color="#007700">;<br /></font><font color="#0000BB">$replacement </font><font color="#007700">= </font><font color="#DD0000">'${1}1,$3'</font><font color="#007700">;<br />echo </font><font color="#0000BB">preg_replace</font><font color="#007700">(</font><font color="#0000BB">$pattern</font><font color="#007700">, </font><font color="#0000BB">$replacement</font><font color="#007700">, </font><font color="#0000BB">$string</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>O exemplo acima irá imprimir:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>April1,2003</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN167445"
></A
><P
><B
>Exemplo 2. Using indexed arrays with <B
CLASS="function"
>preg_replace()</B
></B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$string </font><font color="#007700">= </font><font color="#DD0000">'The quick brown fox jumped over the lazy dog.'</font><font color="#007700">;<br /></font><font color="#0000BB">$patterns</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">] = </font><font color="#DD0000">'/quick/'</font><font color="#007700">;<br /></font><font color="#0000BB">$patterns</font><font color="#007700">[</font><font color="#0000BB">1</font><font color="#007700">] = </font><font color="#DD0000">'/brown/'</font><font color="#007700">;<br /></font><font color="#0000BB">$patterns</font><font color="#007700">[</font><font color="#0000BB">2</font><font color="#007700">] = </font><font color="#DD0000">'/fox/'</font><font color="#007700">;<br /></font><font color="#0000BB">$replacements</font><font color="#007700">[</font><font color="#0000BB">2</font><font color="#007700">] = </font><font color="#DD0000">'bear'</font><font color="#007700">;<br /></font><font color="#0000BB">$replacements</font><font color="#007700">[</font><font color="#0000BB">1</font><font color="#007700">] = </font><font color="#DD0000">'black'</font><font color="#007700">;<br /></font><font color="#0000BB">$replacements</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">] = </font><font color="#DD0000">'slow'</font><font color="#007700">;<br />echo </font><font color="#0000BB">preg_replace</font><font color="#007700">(</font><font color="#0000BB">$patterns</font><font color="#007700">, </font><font color="#0000BB">$replacements</font><font color="#007700">, </font><font color="#0000BB">$string</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>O exemplo acima irá imprimir:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>The bear black slow jumped over the lazy dog.</PRE
></TD
></TR
></TABLE
><P
>&#13;     By ksorting patterns and replacements, we should get what we wanted.
    </P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />ksort</font><font color="#007700">(</font><font color="#0000BB">$patterns</font><font color="#007700">);<br /></font><font color="#0000BB">ksort</font><font color="#007700">(</font><font color="#0000BB">$replacements</font><font color="#007700">);<br />echo </font><font color="#0000BB">preg_replace</font><font color="#007700">(</font><font color="#0000BB">$patterns</font><font color="#007700">, </font><font color="#0000BB">$replacements</font><font color="#007700">, </font><font color="#0000BB">$string</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>O exemplo acima irá imprimir:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>The slow black bear jumped over the lazy dog.</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN167456"
></A
><P
><B
>Exemplo 3. Replacing several values</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$patterns </font><font color="#007700">= array (</font><font color="#DD0000">'/(19|20)(\d{2})-(\d{1,2})-(\d{1,2})/'</font><font color="#007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#DD0000">'/^\s*{(\w+)}\s*=/'</font><font color="#007700">);<br /></font><font color="#0000BB">$replace </font><font color="#007700">= array (</font><font color="#DD0000">'\3/\4/\1\2'</font><font color="#007700">, </font><font color="#DD0000">'$\1 ='</font><font color="#007700">);<br />echo </font><font color="#0000BB">preg_replace</font><font color="#007700">(</font><font color="#0000BB">$patterns</font><font color="#007700">, </font><font color="#0000BB">$replace</font><font color="#007700">, </font><font color="#DD0000">'{startDate} = 1999-5-27'</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>O exemplo acima irá imprimir:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>$startDate = 5/27/1999</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN167462"
></A
><P
><B
>Exemplo 4. Using the 'e' modifier</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />preg_replace</font><font color="#007700">(</font><font color="#DD0000">"/(&lt;\/?)(\w+)([^&gt;]*&gt;)/e"</font><font color="#007700">, <br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#DD0000">"'\\1'.strtoupper('\\2').'\\3'"</font><font color="#007700">, <br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$html_body</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>&#13;     This would capitalize all HTML tags in the input text.
    </P
></DIV
></TD
></TR
></TABLE
>
  </P
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN167467"
></A
><P
><B
>Exemplo 5. Strip whitespace</B
></P
><P
>&#13;     This example strips excess whitespace from a string.
    </P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$str </font><font color="#007700">= </font><font color="#DD0000">'foo&nbsp;&nbsp;&nbsp;o'</font><font color="#007700">;<br /></font><font color="#0000BB">$str </font><font color="#007700">= </font><font color="#0000BB">preg_replace</font><font color="#007700">(</font><font color="#DD0000">'/\s\s+/'</font><font color="#007700">, </font><font color="#DD0000">' '</font><font color="#007700">, </font><font color="#0000BB">$str</font><font color="#007700">);<br /></font><font color="#FF8000">// This will be 'foo o' now<br /></font><font color="#007700">echo </font><font color="#0000BB">$str</font><font color="#007700">;<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
><P
>&#13;   <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN167472"
></A
><P
><B
>Exemplo 6. Using the <CODE
CLASS="parameter"
>count</CODE
> parameter</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$count </font><font color="#007700">= </font><font color="#0000BB">0</font><font color="#007700">;<br /><br />echo </font><font color="#0000BB">preg_replace</font><font color="#007700">(array(</font><font color="#DD0000">'/\d/'</font><font color="#007700">, </font><font color="#DD0000">'/\s/'</font><font color="#007700">), </font><font color="#DD0000">'*'</font><font color="#007700">, </font><font color="#DD0000">'xp 4 to'</font><font color="#007700">, -</font><font color="#0000BB">1 </font><font color="#007700">, </font><font color="#0000BB">$count</font><font color="#007700">);<br />echo </font><font color="#0000BB">$count</font><font color="#007700">; </font><font color="#FF8000">//3<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>O exemplo acima irá imprimir:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>xp***to
3</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN167478"
></A
><H2
>Notas</H2
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
    When using arrays with <CODE
CLASS="parameter"
>pattern</CODE
> and
    <CODE
CLASS="parameter"
>replacement</CODE
>, 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
    <CODE
CLASS="parameter"
>pattern</CODE
> should be replaced by which
    <CODE
CLASS="parameter"
>replacement</CODE
>, 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
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN167489"
></A
><H2
>Veja também</H2
><P
>&#13;   <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.preg-match.html"
><B
CLASS="function"
>preg_match()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.preg-replace-callback.html"
><B
CLASS="function"
>preg_replace_callback()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.preg-split.html"
><B
CLASS="function"
>preg_split()</B
></A
></TD
></TR
></TBODY
></TABLE
><P
></P
>
  </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"
>Anterior</A
></TD
><TD
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>Principal</A
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>preg_replace_callback</TD
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>preg_split</TD
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