mirror of
https://github.com/sigmasternchen/php-doc-en
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96c9d88bad
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@297028 c90b9560-bf6c-de11-be94-00142212c4b1
151 lines
3.8 KiB
XML
151 lines
3.8 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.count-chars">
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<refnamediv>
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<refname>count_chars</refname>
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<refpurpose>Return information about characters used in a 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>count_chars</methodname>
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<methodparam><type>string</type><parameter>string</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>0</initializer></methodparam>
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</methodsynopsis>
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<para>
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Counts the number of occurrences of every byte-value (0..255) in
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<parameter>string</parameter> and returns it in various ways.
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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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<variablelist>
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<varlistentry>
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<term><parameter>string</parameter></term>
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<listitem>
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<para>
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The examined string.
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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>mode</parameter></term>
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<listitem>
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<para>
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See return values.
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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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Depending on <parameter>mode</parameter>
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<function>count_chars</function> returns one of the following:
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<itemizedlist>
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<listitem>
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<simpara>
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0 - an array with the byte-value as key and the frequency of
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every byte as value.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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1 - same as 0 but only byte-values with a frequency greater
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than zero are listed.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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2 - same as 0 but only byte-values with a frequency equal to
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zero are listed.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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3 - a string containing all unique characters is returned.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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4 - a string containing all not used characters is returned.
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</simpara>
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</listitem>
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</itemizedlist>
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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><function>count_chars</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$data = "Two Ts and one F.";
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foreach (count_chars($data, 1) as $i => $val) {
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echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
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}
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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There were 4 instance(s) of " " in the string.
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There were 1 instance(s) of "." in the string.
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There were 1 instance(s) of "F" in the string.
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There were 2 instance(s) of "T" in the string.
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There were 1 instance(s) of "a" in the string.
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There were 1 instance(s) of "d" in the string.
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There were 1 instance(s) of "e" in the string.
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There were 2 instance(s) of "n" in the string.
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There were 2 instance(s) of "o" in the string.
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There were 1 instance(s) of "s" in the string.
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There were 1 instance(s) of "w" in the string.
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]]>
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</screen>
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</example>
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</para>
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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>strpos</function></member>
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<member><function>substr_count</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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