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>preg_replace_callback</H1
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NAME="AEN100143"
></A
><P
> (PHP 4 >= 4.0.5, PHP 5)</P
>preg_replace_callback -- Perform a regular expression search and replace using a callback</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN100146"
></A
><H2
>Description</H2
>mixed <B
CLASS="methodname"
>preg_replace_callback</B
> ( mixed pattern, callback callback, mixed subject [, int limit])<BR
></BR
><P
> The behavior of this function is almost identical to
<A
HREF="function.preg-replace.html"
><B
CLASS="function"
>preg_replace()</B
></A
>, except for the fact that instead of
<VAR
CLASS="parameter"
>replacement</VAR
> parameter, one should specify a
<VAR
CLASS="parameter"
>callback</VAR
> that will be called and passed an array of
matched elements in the subject string. The callback should return the
replacement string.
</P
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><P
><B
>Exemplu 1. <B
CLASS="function"
>preg_replace_callback()</B
> example</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br /> </font><font color="#FF8000">// this text was used in 2002<br /> // we want to get this up to date for 2003<br /> </font><font color="#0000BB">$text </font><font color="#007700">= </font><font color="#DD0000">"April fools day is 04/01/2002\n"</font><font color="#007700">;<br /> </font><font color="#0000BB">$text</font><font color="#007700">.= </font><font color="#DD0000">"Last christmas was 12/24/2001\n"</font><font color="#007700">;<br /><br /> </font><font color="#FF8000">// the callback function<br /> </font><font color="#007700">function </font><font color="#0000BB">next_year</font><font color="#007700">(</font><font color="#0000BB">$matches</font><font color="#007700">) <br /> {<br /> </font><font color="#FF8000">// as usual: $matches[0] is the complete match<br /> // $matches[1] the match for the first subpattern<br /> // enclosed in '(...)' and so on<br /> </font><font color="#007700">return </font><font color="#0000BB">$matches</font><font color="#007700">[</font><font color="#0000BB">1</font><font color="#007700">].(</font><font color="#0000BB">$matches</font><font color="#007700">[</font><font color="#0000BB">2</font><font color="#007700">]+</font><font color="#0000BB">1</font><font color="#007700">);<br /> }<br /><br /> echo </font><font color="#0000BB">preg_replace_callback</font><font color="#007700">(<br /> </font><font color="#DD0000">"|(\d{2}/\d{2}/)(\d{4})|"</font><font color="#007700">,<br /> </font><font color="#DD0000">"next_year"</font><font color="#007700">,<br /> </font><font color="#0000BB">$text</font><font color="#007700">);<br /><br /> </font><font color="#FF8000">// result is:<br /> // April fools day is 04/01/2003<br /> // Last christmas was 12/24/2002<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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><P
> You'll often need the <VAR
CLASS="parameter"
>callback</VAR
> function
for a <B
CLASS="function"
>preg_replace_callback()</B
> in just one place.
In this case you can use <A
HREF="function.create-function.html"
><B
CLASS="function"
>create_function()</B
></A
> to
declare an anonymous function as callback within the call to
<B
CLASS="function"
>preg_replace_callback()</B
>. By doing it this way
you have all information for the call in one place and do not
clutter the function namespace with a callback functions name
not used anywhere else.
</P
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><P
><B
>Exemplu 2. <B
CLASS="function"
>preg_replace_callback()</B
> and <A
HREF="function.create-function.html"
><B
CLASS="function"
>create_function()</B
></A
></B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br /> </font><font color="#FF8000">/* a unix-style command line filter to convert uppercase<br /> * letters at the beginning of paragraphs to lowercase */<br /><br /> </font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">"php://stdin"</font><font color="#007700">, </font><font color="#DD0000">"r"</font><font color="#007700">) or die(</font><font color="#DD0000">"can't read stdin"</font><font color="#007700">);<br /> while (!</font><font color="#0000BB">feof</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">)) {<br /> </font><font color="#0000BB">$line </font><font color="#007700">= </font><font color="#0000BB">fgets</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /> </font><font color="#0000BB">$line </font><font color="#007700">= </font><font color="#0000BB">preg_replace_callback</font><font color="#007700">(<br /> </font><font color="#DD0000">'|<p>\s*\w|'</font><font color="#007700">,<br /> </font><font color="#0000BB">create_function</font><font color="#007700">(<br /> </font><font color="#FF8000">// single quotes are essential here,<br /> // or alternative escape all $ as \$<br /> </font><font color="#DD0000">'$matches'</font><font color="#007700">,<br /> </font><font color="#DD0000">'return strtolower($matches[0]);'<br /> </font><font color="#007700">),<br /> </font><font color="#0000BB">$line<br /> </font><font color="#007700">);<br /> echo </font><font color="#0000BB">$line</font><font color="#007700">;<br /> }<br /> </font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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><P
> See also <A
HREF="function.preg-replace.html"
><B
CLASS="function"
>preg_replace()</B
></A
> and
<A
HREF="function.create-function.html"
><B
CLASS="function"
>create_function()</B
></A
>.
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