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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="reflectionparameter.gettype" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>ReflectionParameter::getType</refname>
<refpurpose>Gets a parameter's type</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis role="ReflectionParameter">
<modifier>public</modifier> <type class="union"><type>ReflectionType</type><type>null</type></type><methodname>ReflectionParameter::getType</methodname>
<void/>
</methodsynopsis>
<para>
Gets the associated type of a parameter.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
&no.function.parameters;
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a <classname>ReflectionType</classname> object if a parameter type is
specified, &null; otherwise.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><methodname>ReflectionParameter::getType</methodname> Usage as of PHP 7.1.0</title>
<simpara>
As of PHP 7.1.0, <methodname>ReflectionType::__toString</methodname> is deprecated, and
<methodname>ReflectionParameter::getType</methodname> <emphasis>may</emphasis> return an
instance of <classname>ReflectionNamedType</classname>. To get the name of the parameter type,
<methodname>ReflectionNamedType</methodname> is available in this case.
</simpara>
<programlisting role="php">
<![CDATA[
<?php
function someFunction(int $param, $param2) {}
$reflectionFunc = new ReflectionFunction('someFunction');
$reflectionParams = $reflectionFunc->getParameters();
$reflectionType1 = $reflectionParams[0]->getType();
$reflectionType2 = $reflectionParams[1]->getType();
assert($reflectionType1 instanceof ReflectionNamedType);
echo $reflectionType1->getName(), PHP_EOL;
var_dump($reflectionType2);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
int
NULL
]]>
</screen>
</example>
</para>
<para>
<example>
<title><methodname>ReflectionParameter::getType</methodname> Usage before PHP 7.1.0</title>
<programlisting role="php">
<![CDATA[
<?php
function someFunction(int $param, $param2) {}
$reflectionFunc = new ReflectionFunction('someFunction');
$reflectionParams = $reflectionFunc->getParameters();
$reflectionType1 = $reflectionParams[0]->getType();
$reflectionType2 = $reflectionParams[1]->getType();
echo $reflectionType1, PHP_EOL;
var_dump($reflectionType2);
?>
]]>
</programlisting>
&example.outputs.70;
<screen>
<![CDATA[
int
NULL
]]>
</screen>
</example>
<example>
<title><methodname>ReflectionParameter::getType</methodname> Usage in PHP 8.0.0 and later</title>
<para>
As of PHP 8.0.0, this method may return a <classname>ReflectionNamedType</classname> instance or
a <classname>ReflectionUnionType</classname> instance. The latter is a collection of the former.
To analyze a type, it is often convenient to normalize it to an array of <classname>ReflectionNamedType</classname>
objects. The following function will return an array of <literal>0</literal> or more <classname>ReflectionNamedType</classname>
instances.
</para>
<programlisting role="php">
<![CDATA[
<?php
function getAllTypes(ReflectionParameter $reflectionParameter): array
{
$reflectionType = $reflectionParameter->getType();
if (!$reflectionType) return [];
return $reflectionType instanceof ReflectionUnionType
? $reflectionType->getTypes()
: [$reflectionType];
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><methodname>ReflectionParameter::hasType</methodname></member>
<member><methodname>ReflectionType::__toString</methodname></member>
</simplelist>
</para>
</refsect1>
</refentry>
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mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
|
