archived-doc-en/reference/reflection/reflectionfunctionabstract/getclosurecalledclass.xml

<?xml version="1.0" encoding="utf-8"?>
<refentry xml:id="reflectionfunctionabstract.getclosurecalledclass" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>ReflectionFunctionAbstract::getClosureCalledClass</refname>
  <refpurpose>Returns the class corresponding to static:: inside a closure</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis role="ReflectionFunctionAbstract">
   <modifier>public</modifier> <type class="union"><type>ReflectionClass</type><type>null</type></type><methodname>ReflectionFunctionAbstract::getClosureCalledClass</methodname>
   <void/>
  </methodsynopsis>
  <simpara>
   Returns the class as a <classname>ReflectionClass</classname> that
   corresponds to resolving the class name corresponding to <literal>static::</literal> inside the
   <classname>Closure</classname>.
  </simpara>
 </refsect1>

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

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <simpara>
   Returns a <classname>ReflectionClass</classname> corresponding to the class
   represented by <literal>static::</literal> in the <classname>Closure</classname>.
   If the function is not a closure or if it has global scope &null;
   is returned instead.
  </simpara>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title>
    Example showcasing difference between
    <methodname>ReflectionFunctionAbstract::getClosureCalledClass</methodname>,
    <methodname>ReflectionFunctionAbstract::getClosureScopeClass</methodname>,
    and <methodname>ReflectionFunctionAbstract::getClosureThis</methodname>
    with a closure in the object context
   </title>
   <programlisting role="php">
<![CDATA[
<?php

class A
{
    public function getClosure()
    {
        var_dump(self::class, static::class);

        return function() {};
    }
}

class B extends A {}

$b = new B();
$c = $b->getClosure();
$r = new ReflectionFunction($c);

var_dump($r->getClosureThis()); // $this === $b, since a non-static closure take the object context
var_dump($r->getClosureScopeClass()); // Corresponds to the self::class resolution inside a closure
var_dump($r->getClosureCalledClass()); // Corresponds to the static::class resolution inside a closure

?>
]]>
   </programlisting>
   &example.outputs;
   <screen>
<![CDATA[
string(1) "A"
string(1) "B"
object(B)#1 (0) {
}
object(ReflectionClass)#4 (1) {
  ["name"]=>
  string(1) "A"
}
object(ReflectionClass)#4 (1) {
  ["name"]=>
  string(1) "B"
}
]]>
   </screen>
  </example>
  <example>
   <title>
    Example showcasing difference between
    <methodname>ReflectionFunctionAbstract::getClosureCalledClass</methodname>,
    <methodname>ReflectionFunctionAbstract::getClosureScopeClass</methodname>,
    and <methodname>ReflectionFunctionAbstract::getClosureThis</methodname>
    with a static closure without an object context
   </title>
   <programlisting role="php">
    <![CDATA[
<?php

class A
{
    public function getClosure()
    {
        var_dump(self::class, static::class);

        return static function() {};
    }
}

class B extends A {}

$b = new B();
$c = $b->getClosure();
$r = new ReflectionFunction($c);

var_dump($r->getClosureThis()); // NULL, since the pseudo-variable $this is not available in a static context
var_dump($r->getClosureScopeClass()); // Corresponds to the self::class resolution inside a closure
var_dump($r->getClosureCalledClass()); // Corresponds to the static::class resolution inside a closure

?>
]]>
   </programlisting>
   &example.outputs;
   <screen>
<![CDATA[
string(1) "A"
string(1) "B"
NULL
object(ReflectionClass)#4 (1) {
  ["name"]=>
  string(1) "A"
}
object(ReflectionClass)#4 (1) {
  ["name"]=>
  string(1) "B"
}

]]>
   </screen>
  </example>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><methodname>ReflectionFunctionAbstract::getClosureScopeClass</methodname></member>
   <member><methodname>ReflectionFunctionAbstract::getClosureThis</methodname></member>
   <member><xref linkend="language.oop5.late-static-bindings" /></member>
  </simplelist>
 </refsect1>

</refentry>
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