archived-doc-zh/reference/reflection/reflectionclass/getconstant.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="reflectionclass.getconstant" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>ReflectionClass::getConstant</refname>
  <refpurpose>获取已定义的常量</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis role="ReflectionClass">
   <modifier>public</modifier> <type>mixed</type><methodname>ReflectionClass::getConstant</methodname>
   <methodparam><type>string</type><parameter>name</parameter></methodparam>
  </methodsynopsis>
  <para>
   获取已定义的常量。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>name</parameter></term>
     <listitem>
      <para>
       要获取的类常量的名称。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   常量名称为 <parameter>name</parameter> 的值。
   如果在类中没有找到该常量，则返回 &false; 。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>使用 <methodname>ReflectionClass::getConstant</methodname></title>
    <programlisting role="php">
<![CDATA[
<?php

class Example {
    const C1 = false;
    const C2 = 'I am a constant';
}

$reflection = new ReflectionClass('Example');

var_dump($reflection->getConstant('C1'));
var_dump($reflection->getConstant('C2'));
var_dump($reflection->getConstant('C3'));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
bool(false)
string(15) "I am a constant"
bool(false)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>ReflectionClass::getConstants</methodname></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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