php-doc-en/reference/reflection/reflectionparameter/getdefaultvalue.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->

<refentry xml:id="reflectionparameter.getdefaultvalue" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>ReflectionParameter::getDefaultValue</refname>
  <refpurpose>Gets default parameter value</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <modifier>public</modifier> <type>mixed</type><methodname>ReflectionParameter::getDefaultValue</methodname>
   <void />
  </methodsynopsis>
  <para>
   Gets the default value of the parameter for a user-defined function or method.
   If the parameter is not optional a <classname>ReflectionException</classname>
   will be thrown.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The parameters default value.
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Getting </title>
    <programlisting role="php">
<![CDATA[
<?php
function foo($test, $bar = 'baz')
{
    echo $test . $bar;
}

$function = new ReflectionFunction('foo');

foreach ($function->getParameters() as $param) {
    echo 'Name: ' . $param->getName() . PHP_EOL;
    if ($param->isOptional()) {
        echo 'Default value: ' . $param->getDefaultValue() . PHP_EOL;
    }
    echo PHP_EOL;
}
?>
]]>
    </programlisting>
    &example.outputs;
   <screen>
<![CDATA[
Name: test

Name: bar
Default value: baz
]]>
   </screen>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    Due to implementation details, it is not possible to get the default value
    of built-in functions or methods of built-in classes. Trying to do this will
    result a <classname>ReflectionException</classname> being thrown.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>ReflectionParameter::isOptional</methodname></member>
    <member><methodname>ReflectionParameter::isPassedByReference</methodname></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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