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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@78496 c90b9560-bf6c-de11-be94-00142212c4b1
129 lines
4.2 KiB
XML
129 lines
4.2 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.2 $ -->
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<!-- splitted from ./en/functions/regex.xml, last change in rev 1.2 -->
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<refentry id="function.ereg-replace">
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<refnamediv>
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<refname>ereg_replace</refname>
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<refpurpose>Replace regular expression</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>string</type><methodname>ereg_replace</methodname>
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<methodparam><type>string</type><parameter>pattern</parameter></methodparam>
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<methodparam><type>string</type><parameter>replacement</parameter></methodparam>
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<methodparam><type>string</type><parameter>string</parameter></methodparam>
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</methodsynopsis>
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<note>
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<para>
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<function>preg_replace</function>, which uses a Perl-compatible
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regular expression syntax, is often a faster alternative to
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<function>ereg_replace</function>.
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</para>
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</note>
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<simpara>
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This function scans <parameter>string</parameter> for matches to
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<parameter>pattern</parameter>, then replaces the matched text
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with <parameter>replacement</parameter>.
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</simpara>
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<simpara>
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The modified string is returned. (Which may mean that the
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original string is returned if there are no matches to be
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replaced.)
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</simpara>
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<simpara>
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If <parameter>pattern</parameter> contains parenthesized
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substrings, <parameter>replacement</parameter> may contain
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substrings of the form
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<literal>\\<replaceable>digit</replaceable></literal>, which will
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be replaced by the text matching the digit'th parenthesized
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substring; <literal>\\0</literal> will produce the entire
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contents of string. Up to nine substrings may be used.
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Parentheses may be nested, in which case they are counted by the
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opening parenthesis.
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</simpara>
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<simpara>
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If no matches are found in <parameter>string</parameter>, then
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<parameter>string</parameter> will be returned unchanged.
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</simpara>
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<para>
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For example, the following code snippet prints "This was a test"
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three times:
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<example>
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<title><function>ereg_replace</function> Example</title>
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<programlisting>
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<![CDATA[
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$string = "This is a test";
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echo ereg_replace (" is", " was", $string);
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echo ereg_replace ("( )is", "\\1was", $string);
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echo ereg_replace ("(( )is)", "\\2was", $string);
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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One thing to take note of is that if you use an integer value as
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the <parameter>replacement</parameter> parameter, you may not get
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the results you expect. This is because
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<function>ereg_replace</function> will interpret the number as
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the ordinal value of a character, and apply that. For instance:
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<example>
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<title><function>ereg_replace</function> Example</title>
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<programlisting>
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<![CDATA[
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<?php
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/* This will not work as expected. */
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$num = 4;
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$string = "This string has four words.";
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$string = ereg_replace('four', $num, $string);
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echo $string; /* Output: 'This string has words.' */
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/* This will work. */
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$num = '4';
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$string = "This string has four words.";
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$string = ereg_replace('four', $num, $string);
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echo $string; /* Output: 'This string has 4 words.' */
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title>Replace URLs with links</title>
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<programlisting role="php">
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<![CDATA[
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$text = ereg_replace("[[:alpha:]]+://[^<>[:space:]]+[[:alnum:]/]",
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"<a href=\"\\0\">\\0</a>", $text);
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]]>
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</programlisting>
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</example>
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</para>
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<simpara>
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See also <function>ereg</function>, <function>eregi</function>,
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<function>eregi_replace</function>, <function>str_replace</function>,
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and <function>preg_match</function>.
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</simpara>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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