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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@309935 c90b9560-bf6c-de11-be94-00142212c4b1
260 lines
7.8 KiB
XML
260 lines
7.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.str-replace">
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<refnamediv>
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<refname>str_replace</refname>
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<refpurpose>Replace all occurrences of the search string with the replacement string</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>mixed</type><methodname>str_replace</methodname>
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<methodparam><type>mixed</type><parameter>search</parameter></methodparam>
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<methodparam><type>mixed</type><parameter>replace</parameter></methodparam>
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<methodparam><type>mixed</type><parameter>subject</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter role="reference">count</parameter></methodparam>
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</methodsynopsis>
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<para>
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This function returns a string or an array with all occurrences of
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<parameter>search</parameter> in <parameter>subject</parameter>
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replaced with the given <parameter>replace</parameter> value.
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</para>
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<para>
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If you don't need fancy replacing rules (like regular expressions), you
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should always use this function instead of <function>preg_replace</function>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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If <parameter>search</parameter> and <parameter>replace</parameter> are
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arrays, then <function>str_replace</function> takes a value from each array
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and uses them to search and replace on <parameter>subject</parameter>. If
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<parameter>replace</parameter> has fewer values than
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<parameter>search</parameter>, then an empty string is used for the rest of
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replacement values. If <parameter>search</parameter> is an array and
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<parameter>replace</parameter> is a string, then this replacement string is
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used for every value of <parameter>search</parameter>. The converse would
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not make sense, though.
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</para>
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<para>
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If <parameter>search</parameter> or <parameter>replace</parameter>
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are arrays, their elements are processed first to last.
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</para>
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>search</parameter></term>
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<listitem>
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<para>
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The value being searched for, otherwise known as the <emphasis>needle</emphasis>.
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An array may be used to designate multiple needles.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>replace</parameter></term>
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<listitem>
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<para>
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The replacement value that replaces found <parameter>search</parameter>
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values. An array may be used to designate multiple replacements.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>subject</parameter></term>
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<listitem>
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<para>
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The string or array being searched and replaced on,
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otherwise known as the <emphasis>haystack</emphasis>.
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</para>
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<para>
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If <parameter>subject</parameter> is an array, then the search and
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replace is performed with every entry of
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<parameter>subject</parameter>, and the return value is an array as
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well.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>count</parameter></term>
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<listitem>
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<para>
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If passed, this will be set to the number of replacements performed.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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This function returns a string or an array with the replaced values.
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</para>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>5.0.0</entry>
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<entry>
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The <parameter>count</parameter> parameter was added.
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</entry>
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</row>
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<row>
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<entry>4.3.3</entry>
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<entry>
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The behaviour of this function changed. In older versions a bug
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existed when using arrays as both <parameter>search</parameter> and
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<parameter>replace</parameter> parameters which caused empty
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<parameter>search</parameter> indexes to be skipped without advancing
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the internal pointer on the <parameter>replace</parameter> array.
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This has been corrected in PHP 4.3.3, any scripts which relied on
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this bug should remove empty search values prior to calling this
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function in order to mimic the original behavior.
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</entry>
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</row>
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<row>
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<entry>4.0.5</entry>
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<entry>
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Most parameters can now be an <type>array</type>.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Basic <function>str_replace</function> examples</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Provides: <body text='black'>
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$bodytag = str_replace("%body%", "black", "<body text='%body%'>");
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// Provides: Hll Wrld f PHP
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$vowels = array("a", "e", "i", "o", "u", "A", "E", "I", "O", "U");
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$onlyconsonants = str_replace($vowels, "", "Hello World of PHP");
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// Provides: You should eat pizza, beer, and ice cream every day
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$phrase = "You should eat fruits, vegetables, and fiber every day.";
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$healthy = array("fruits", "vegetables", "fiber");
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$yummy = array("pizza", "beer", "ice cream");
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$newphrase = str_replace($healthy, $yummy, $phrase);
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// Provides: 2
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$str = str_replace("ll", "", "good golly miss molly!", $count);
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echo $count;
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title>Examples of potential <function>str_replace</function> gotchas</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// Order of replacement
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$str = "Line 1\nLine 2\rLine 3\r\nLine 4\n";
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$order = array("\r\n", "\n", "\r");
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$replace = '<br />';
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// Processes \r\n's first so they aren't converted twice.
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$newstr = str_replace($order, $replace, $str);
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// Outputs F because A is replaced with B, then B is replaced with C, and so on...
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// Finally E is replaced with F, because of left to right replacements.
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$search = array('A', 'B', 'C', 'D', 'E');
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$replace = array('B', 'C', 'D', 'E', 'F');
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$subject = 'A';
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echo str_replace($search, $replace, $subject);
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// Outputs: apearpearle pear
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// For the same reason mentioned above
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$letters = array('a', 'p');
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$fruit = array('apple', 'pear');
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$text = 'a p';
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$output = str_replace($letters, $fruit, $text);
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echo $output;
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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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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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¬e.bin-safe;
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<caution>
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<title>Replacement order gotcha</title>
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<para>
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Because <function>str_replace</function> replaces left to right, it might
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replace a previously inserted value when doing multiple replacements.
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See also the examples in this document.
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</para>
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</caution>
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<note>
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<para>
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This function is case-sensitive. Use <function>str_ireplace</function>
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for case-insensitive replace.
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</para>
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</note>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>str_ireplace</function></member>
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<member><function>substr_replace</function></member>
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<member><function>preg_replace</function></member>
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<member><function>strtr</function></member>
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</simplelist>
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</para>
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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:"~/.phpdoc/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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