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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.is-scalar" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>is_scalar</refname>
<refpurpose>
Finds whether a variable is a scalar
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>is_scalar</methodname>
<methodparam><type>mixed</type><parameter>value</parameter></methodparam>
</methodsynopsis>
<para>
Finds whether an <link linkend="language.expressions">expression</link> is
evaluated as a scalar value.
</para>
<para>
See <link linkend="language.types.type-system.atomic.scalar">scalar types</link> for more information.
</para>
<note>
<para>
<function>is_scalar</function> does not consider <type>resource</type>
type values to be scalar as resources are abstract datatypes
which are currently based on integers. This implementation detail should
not be relied upon, as it may change.
</para>
</note>
<note>
<para>
<function>is_scalar</function> does not consider NULL to be scalar.
</para>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>value</parameter></term>
<listitem>
<para>
The variable being evaluated.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns &true; if <parameter>value</parameter> is a scalar, &false;
otherwise.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>is_scalar</function> example</title>
<programlisting role="php">
<!-- TODO: better example, this one can be quite misleading for unexperienced
programmers. -->
<![CDATA[
<?php
function show_var($var)
{
if (is_scalar($var)) {
echo $var;
} else {
var_dump($var);
}
}
$pi = 3.1416;
$proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin");
show_var($pi);
show_var($proteins)
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
3.1416
array(3) {
[0]=>
string(10) "hemoglobin"
[1]=>
string(20) "cytochrome c oxidase"
[2]=>
string(10) "ferredoxin"
}
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>is_float</function></member>
<member><function>is_int</function></member>
<member><function>is_numeric</function></member>
<member><function>is_real</function></member>
<member><function>is_string</function></member>
<member><function>is_bool</function></member>
<member><function>is_object</function></member>
<member><function>is_array</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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