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<refentry xml:id="function.is-string" xmlns="http://docbook.org/ns/docbook">

<refnamediv>

<refname>is_string</refname>

<refpurpose>Comprueba si una variable es de tipo string</refpurpose>

</refnamediv>

<refsect1 role="description">

&reftitle.description;

<methodsynopsis>

<type>bool</type><methodname>is_string</methodname>

<methodparam><type>mixed</type><parameter>var</parameter></methodparam>

</methodsynopsis>

<para>

Obtiene si la variable dada es de tipo string.

</para>

</refsect1>

<refsect1 role="parameters">

&reftitle.parameters;

<para>

<variablelist>

<varlistentry>

<term><parameter>var</parameter></term>

<listitem>

<para>

La variable a ser evaluada.

</para>

</listitem>

</varlistentry>

</variablelist>

</para>

</refsect1>

<refsect1 role="returnvalues">

&reftitle.returnvalues;

<para>

Devuelve &true; si <parameter>var</parameter> es de tipo <type>string</type>,

&false; de lo contrario.

</para>

</refsect1>

<refsect1 role="examples">

&reftitle.examples;

<para>

<example>

<title>Ejemplo <function>is_string</function></title>

<programlisting role="php">

<![CDATA[

<?php

$values = array(false, true, null, 'abc', '23', 23, '23.5', 23.5, '', ' ', '0', 0);

foreach ($values as $value) {

echo "is_string(";

var_export($value);

echo ") = ";

echo var_dump(is_string($value));

}

?>

]]>

</programlisting>

&example.outputs;

<screen>

<![CDATA[

is_string(false) = bool(false)

is_string(true) = bool(false)

is_string(NULL) = bool(false)

is_string('abc') = bool(true)

is_string('23') = bool(true)

is_string(23) = bool(false)

is_string('23.5') = bool(true)

is_string(23.5) = bool(false)

is_string('') = bool(true)

is_string(' ') = bool(true)

is_string('0') = bool(true)

is_string(0) = bool(false)

]]>

</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_bool</function></member>

<member><function>is_object</function></member>

<member><function>is_array</function></member>

</simplelist>

</para>

</refsect1>

</refentry>

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