boolval.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.boolval" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>boolval</refname>
  <refpurpose>Obtener el valor booleano de una variable</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>boolval</methodname>
   <methodparam><type>mixed</type><parameter>var</parameter></methodparam>
  </methodsynopsis>
  <para>
   Devuelve el valor <type>boolean</type> de <parameter>var</parameter>.
  </para>
 </refsect1>
 
 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>var</parameter></term>
    <listitem>
     <para>
      El valor escalar a convertir a un <type>boolean</type>.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   El valor <type>boolean</type> de <parameter>var</parameter>.
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Ejemplos de <function>boolval</function></title>
    <programlisting role="php">
<![CDATA[
<?php
echo '0:        '.(boolval(0) ? 'true' : 'false')."\n";
echo '42:       '.(boolval(42) ? 'true' : 'false')."\n";
echo '0.0:      '.(boolval(0.0) ? 'true' : 'false')."\n";
echo '4.2:      '.(boolval(4.2) ? 'true' : 'false')."\n";
echo '"":       '.(boolval("") ? 'true' : 'false')."\n";
echo '"string": '.(boolval("string") ? 'true' : 'false')."\n";
echo '"0":      '.(boolval("0") ? 'true' : 'false')."\n";
echo '"1":      '.(boolval("1") ? 'true' : 'false')."\n";
echo '[1, 2]:   '.(boolval([1, 2]) ? 'true' : 'false')."\n";
echo '[]:       '.(boolval([]) ? 'true' : 'false')."\n";
echo 'stdClass: '.(boolval(new stdClass) ? 'true' : 'false')."\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
0:        false
42:       true
0.0:      false
4.2:      true
"":       false
"string": true
"0":      false
"1":      true
[1, 2]:   true
[]:       false
stdClass: true
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>floatval</function></member>
    <member><function>intval</function></member>
    <member><function>strval</function></member>
    <member><function>settype</function></member>
    <member><function>is_bool</function></member>
    <member><link linkend="language.types.type-juggling">Manipulación de tipos</link></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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