is-float.xml

<?xml version="1.0" encoding="UTF-8"?>
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<refentry xml:id="function.is-float" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>is_float</refname>
  <refpurpose>Verifica se una variabile è di tipo float (decimale a virgola mobile)</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>is_float</methodname>
   <methodparam><type>mixed</type><parameter>value</parameter></methodparam>
  </methodsynopsis>
  <para>
   Verifica se una variabile è di tipo float (decimale a virgola mobile).
  </para>
  <note>
   <para>
    Per testare se una variabile è un numero o una stringa numerica (come negli input
    dei form, che sono sempre una stringa), bisogna usare
    <function>is_numeric</function>.
   </para>
  </note>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>value</parameter></term>
     <listitem>
      <para>
       La variabile da valutare.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Restituisce &true; se <parameter>value</parameter> è un <type>float</type>,
   &false; in caso contrario.
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Esempio di <function>is_float</function></title>
    <programlisting role="php">
<![CDATA[
<?php

var_dump(is_float(27.25));
var_dump(is_float('abc'));
var_dump(is_float(23));
var_dump(is_float(23.5));
var_dump(is_float(1e7));  //Notazione Scientifica
var_dump(is_float(true));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
bool(true)
bool(false)
bool(false)
bool(true)
bool(true)
bool(false)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>is_bool</function></member>
    <member><function>is_int</function></member>
    <member><function>is_numeric</function></member>
    <member><function>is_string</function></member>
    <member><function>is_array</function></member>
    <member><function>is_object</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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