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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
<!-- splitted from ./en/functions/strings.xml, last change in rev 1.4 -->
<refentry id="function.count-chars">
<refnamediv>
<refname>count_chars</refname>
<refpurpose>
Return information about characters used in a string
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>mixed</type><methodname>count_chars</methodname>
<methodparam><type>string</type><parameter>string</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>mode</parameter></methodparam>
</methodsynopsis>
<para>
Counts the number of occurrences of every byte-value (0..255) in
<parameter>string</parameter> and returns it in various ways.
The optional parameter <parameter>mode</parameter> defaults to
0. 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 used byte-values is returned.
</simpara>
</listitem>
<listitem>
<simpara>
4 - a string containing all not used byte-values is returned.
</simpara>
</listitem>
</itemizedlist>
</para>
<para>
<example>
<title><function>count_chars</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$data = "Two Ts and one F.";
$result = count_chars($data, 0);
for ($i=0; $i < count($result); $i++) {
if ($result[$i] != 0)
echo "There were $result[$i] instance(s) of \"" , chr($i) , "\" in the string.\n";
}
?>
]]>
</programlisting>
<para>
This will output :
</para>
<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>
<simpara>
See also <function>strpos</function> and
<function>substr_count</function>.
</simpara>
</refsect1>
</refentry>
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