is-object.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.is-object" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>is_object</refname>
  <refpurpose>检测变量是否是对象</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>is_object</methodname>
   <methodparam><type>mixed</type><parameter>value</parameter></methodparam>
  </methodsynopsis>
  <para>
   检测变量是否是对象。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>value</parameter></term>
     <listitem>
      <para>
       需要检测的变量。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   如果 <parameter>value</parameter> 是 <type>object</type>，返回
   &true;，否则返回 &false;。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>7.2.0</entry>
       <entry>
        没有定义类（<classname>__PHP_Incomplete_Class</classname> 类）的未序列化对象，<function>is_object</function>
        现在返回 &true;，之前返回 &false;。
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>is_object</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
// 声明简单的函数，从对象中返回数组
function get_students($obj)
{
    if (!is_object($obj)) {
        return false;
    }

    return $obj->students;
}

// 声明新的类实例并填充值
$obj = new stdClass();
$obj->students = array('Kalle', 'Ross', 'Felipe');

var_dump(get_students(null));
var_dump(get_students($obj));
?>
]]>
    </programlisting>
   </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_float</function></member>
    <member><function>is_string</function></member>
    <member><function>is_array</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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