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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.count-chars" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>count_chars</refname>
<refpurpose>Return information about characters used in a string</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>array</type><type>string</type></type><methodname>count_chars</methodname>
<methodparam><type>string</type><parameter>string</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer>0</initializer></methodparam>
</methodsynopsis>
<para>
Counts the number of occurrences of every byte-value (0..255) in
<parameter>string</parameter> and returns it in various ways.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>string</parameter></term>
<listitem>
<para>
The examined string.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>mode</parameter></term>
<listitem>
<para>
See return values.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Depending on <parameter>mode</parameter>
<function>count_chars</function> returns one of the following:
<itemizedlist>
<listitem>
<simpara>
0 - an array with the byte-value as key and the frequency of
every byte as value.
</simpara>
</listitem>
<listitem>
<simpara>
1 - same as 0 but only byte-values with a frequency greater
than zero are listed.
</simpara>
</listitem>
<listitem>
<simpara>
2 - same as 0 but only byte-values with a frequency equal to
zero are listed.
</simpara>
</listitem>
<listitem>
<simpara>
3 - a string containing all unique characters is returned.
</simpara>
</listitem>
<listitem>
<simpara>
4 - a string containing all unused characters is returned.
</simpara>
</listitem>
</itemizedlist>
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.0.0</entry>
<entry>
Prior to this version, the function returned &false; on failure.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>count_chars</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$data = "Two Ts and one F.";
foreach (count_chars($data, 1) as $i => $val) {
echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
}
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
There were 4 instance(s) of " " in the string.
There were 1 instance(s) of "." in the string.
There were 1 instance(s) of "F" in the string.
There were 2 instance(s) of "T" in the string.
There were 1 instance(s) of "a" in the string.
There were 1 instance(s) of "d" in the string.
There were 1 instance(s) of "e" in the string.
There were 2 instance(s) of "n" in the string.
There were 2 instance(s) of "o" in the string.
There were 1 instance(s) of "s" in the string.
There were 1 instance(s) of "w" in the string.
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>strpos</function></member>
<member><function>substr_count</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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