is-numeric.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.is-numeric" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>is_numeric</refname>
  <refpurpose>
   Comprueba si una variable es un número o un string numérico
  </refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>is_numeric</methodname>
   <methodparam><type>mixed</type><parameter>value</parameter></methodparam>
  </methodsynopsis>
  <para>
   Comprueba si la variable dada es numérica o
   <link linkend="language.types.numeric-strings">string numérico</link>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>value</parameter></term>
     <listitem>
      <para>
       La variable a evaluar.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Devuelve &true; si <parameter>var</parameter> es un número o una cadena
   numérica, &false; de lo contrario.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Ejemplos de <function>is_numeric</function></title>
    <programlisting role="php">
<![CDATA[
<?php
$tests = array(
    "42",
    1337,
    0x539,
    02471,
    0b10100111001,
    1337e0,
    "0x539",
    "02471",
    "0b10100111001",
    "1337e0",
    "not numeric",
    array(),
    9.1,
    null
);

foreach ($tests as $element) {
    if (is_numeric($element)) {
        echo var_export($element, true) . " es numérico", PHP_EOL;
    } else {
        echo var_export($element, true) . " NO es numérico", PHP_EOL;
    }
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
'42' is numérico
1337 is numérico
1337 is numérico
1337 is numérico
1337 is numérico
1337.0 is numérico
'0x539' NO es numérico
'02471' is numérico
'0b10100111001' NO es numérico
'1337e0' is numérico
'not numeric' NO es numérico
array (
) NO es numérico
9.1 is numérico
NULL NO es numérico
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><link linkend="language.types.numeric-strings">String numérico</link></member>
    <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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