get-class-vars.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.get-class-vars" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>get_class_vars</refname>
  <refpurpose>获取类的默认属性</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>get_class_vars</methodname>
   <methodparam><type>string</type><parameter>class</parameter></methodparam>
  </methodsynopsis>
  <para>
   获取指定类的默认属性。
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>class</parameter></term>
     <listitem>
      <para>
       类名
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回从当前作用域中声明的可见属性组成的关联数组及其默认值。生成的数组元素采用
   <literal>varname =&gt; value</literal> 的形式，如果出现错误，则返回 &false;。
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>get_class_vars</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php

class MyClass
{
    public $var1; // 这没有明确默认值（技术上默认为 NULL）...
    public $var2 = "xyz";
    public $var3 = 100;
    private $var4;

    public function __construct()
    {
        // 变更属性
        $this->var1 = "foo";
        $this->var2 = "bar";
        return true;
    }
}

$my_class = new MyClass();

$class_vars = get_class_vars(get_class($my_class));

foreach ($class_vars as $name => $value) {
    echo "{$name}: ", var_export($value, true), "\n";
}

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
var1: NULL
var2: 'xyz'
var3: 100
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title><function>get_class_vars</function> 和作用域行为</title>
    <programlisting role="php">
<![CDATA[
<?php

function format($array)
{
    return implode('|', array_keys($array)) . "\r\n";
}

class TestCase
{
    public $a    = 1;
    protected $b = 2;
    private $c   = 3;

    public static function expose()
    {
        echo format(get_class_vars(__CLASS__));
    }
}

TestCase::expose();
echo format(get_class_vars('TestCase'));

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
// 5.0.0
a| * b| TestCase c
a| * b| TestCase c

// 5.0.1 - 5.0.2
a|b|c
a|b|c

// 5.0.3 +
a|b|c
a
]]>
    </screen>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>get_class_methods</function></member>
    <member><function>get_object_vars</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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