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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<refentry id="function.is-numeric">
<refnamediv>
<refname>is_numeric</refname>
<refpurpose>
Finds whether a variable is a number or a numeric string
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>is_numeric</methodname>
<methodparam><type>mixed</type><parameter>var</parameter></methodparam>
</methodsynopsis>
<para>
Finds whether the given variable is numeric. Numeric strings consist of
optional sign, any number of digits, optional decimal part and optional
exponential part. Thus <literal>+0123.45e6</literal> is a valid numeric
value. Hexadecimal notation (<literal>0xFF</literal>) is allowed too but
only without sign, decimal and exponential part.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>var</parameter></term>
<listitem>
<para>
The variable being evaluated.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns &true; if <parameter>var</parameter> is a number or a numeric
string, &false; otherwise.
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>ctype_digit</function></member>
<member><function>is_bool</function></member>
<member><function>is_null</function></member>
<member><function>is_float</function></member>
<member><function>is_int</function></member>
<member><function>is_string</function></member>
<member><function>is_object</function></member>
<member><function>is_array</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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