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><H1
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>ereg_replace</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN81962"
></A
><P
>    (PHP 3, PHP 4 )</P
>ereg_replace&nbsp;--&nbsp;Replace regular expression</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN81965"
></A
><H2
>Description</H2
>string <B
CLASS="methodname"
>ereg_replace</B
> ( string pattern, string replacement, string string)<BR
></BR
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      <A
HREF="function.preg-replace.html"
><B
CLASS="function"
>preg_replace()</B
></A
>, which uses a Perl-compatible 
      regular expression syntax, is often a faster alternative to
      <B
CLASS="function"
>ereg_replace()</B
>.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     This function scans <TT
CLASS="parameter"
><I
>string</I
></TT
> for matches to
     <TT
CLASS="parameter"
><I
>pattern</I
></TT
>, then replaces the matched text
     with <TT
CLASS="parameter"
><I
>replacement</I
></TT
>.
    </P
><P
>&#13;     The modified string is returned. (Which may mean that the
     original string is returned if there are no matches to be
     replaced.)
    </P
><P
>&#13;     If <TT
CLASS="parameter"
><I
>pattern</I
></TT
> contains parenthesized
     substrings, <TT
CLASS="parameter"
><I
>replacement</I
></TT
> may contain
     substrings of the form
     <TT
CLASS="literal"
>\\<TT
CLASS="replaceable"
><I
>digit</I
></TT
></TT
>, which will
     be replaced by the text matching the digit'th parenthesized
     substring; <TT
CLASS="literal"
>\\0</TT
> will produce the entire
     contents of string.  Up to nine substrings may be used.
     Parentheses may be nested, in which case they are counted by the
     opening parenthesis.
    </P
><P
>&#13;     If no matches are found in <TT
CLASS="parameter"
><I
>string</I
></TT
>, then
     <TT
CLASS="parameter"
><I
>string</I
></TT
> will be returned unchanged.
    </P
><P
>&#13;     For example, the following code snippet prints "This was a test"
     three times:
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN81998"
></A
><P
><B
>Example 1. <B
CLASS="function"
>ereg_replace()</B
> Example</B
></P
><TABLE
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><TD
><PRE
CLASS="programlisting"
>$string = "This is a test";
echo ereg_replace (" is", " was", $string);
echo ereg_replace ("( )is", "\\1was", $string);
echo ereg_replace ("(( )is)", "\\2was", $string);</PRE
></TD
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>
    </P
><P
>&#13;     One thing to take note of is that if you use an integer value as
     the <TT
CLASS="parameter"
><I
>replacement</I
></TT
> parameter, you may not get
     the results you expect. This is because
     <B
CLASS="function"
>ereg_replace()</B
> will interpret the number as
     the ordinal value of a character, and apply that. For instance:
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><DIV
CLASS="example"
><A
NAME="AEN82005"
></A
><P
><B
>Example 2. <B
CLASS="function"
>ereg_replace()</B
> Example</B
></P
><TABLE
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><TD
><PRE
CLASS="programlisting"
>&#60;?php
/* This will not work as expected. */
$num = 4;
$string = "This string has four words.";
$string = ereg_replace('four', $num, $string);
echo $string;   /* Output: 'This string has   words.' */

/* This will work. */
$num = '4';
$string = "This string has four words.";
$string = ereg_replace('four', $num, $string);
echo $string;   /* Output: 'This string has 4 words.' */
?&#62;</PRE
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>
    </P
><P
>&#13;     <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN82010"
></A
><P
><B
>Example 3. Replace URLs with links</B
></P
><TABLE
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><TR
><TD
><PRE
CLASS="php"
>$text = ereg_replace("[[:alpha:]]+://[^&#60;&#62;[:space:]]+[[:alnum:]/]",
                     "&#60;a href=\"\\0\"&#62;\\0&#60;/a&#62;", $text);</PRE
></TD
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></TD
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>
    </P
><P
>&#13;     See also <A
HREF="function.ereg.html"
><B
CLASS="function"
>ereg()</B
></A
>, <A
HREF="function.eregi.html"
><B
CLASS="function"
>eregi()</B
></A
>,
     <A
HREF="function.eregi-replace.html"
><B
CLASS="function"
>eregi_replace()</B
></A
>, <A
HREF="function.str-replace.html"
><B
CLASS="function"
>str_replace()</B
></A
>,
     and <A
HREF="function.preg-match.html"
><B
CLASS="function"
>preg_match()</B
></A
>.
    </P
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