This method will return the parent's constructor, if the current class does not override it.
NULL will only be returned when the class has no constructor AND none of its parents have a constructor either.
(PHP 5, PHP 7, PHP 8)
ReflectionClass::getConstructor — Obtém o construtor da classe
Obtém o construtor da classe refletida.
Esta função não possui parâmetros.
Um objeto ReflectionMethod refletindo o construtor da classe ou null se a classe
não tem construtor.
Exemplo #1 Uso básico de ReflectionClass::getConstructor()
<?php
$class = new ReflectionClass('ReflectionClass');
$constructor = $class->getConstructor();
var_dump($constructor);
?>O exemplo acima produzirá:
object(ReflectionMethod)#2 (2) {
["name"]=>
string(11) "__construct"
["class"]=>
string(15) "ReflectionClass"
}
This method will return the parent's constructor, if the current class does not override it.
NULL will only be returned when the class has no constructor AND none of its parents have a constructor either.Just posting some example code for anyone wanting to mess around with this stuff:
<?php
class Say
{
private $what_to_say;
public function __construct($no_default, $word = "Hello World", $options = array('a', 'b'))
{
$this->what_to_say = $word;
}
public function speak()
{
echo $this->what_to_say;
}
}
$class = new ReflectionClass('Say');
$constructor = $class->getConstructor();
echo $constructor;
/* OUTPUTS:
Method [ <user, ctor> public method __construct ] {
@@ /reflect.php 6 - 9
- Parameters [3] {
Parameter #0 [ <required> $no_default ]
Parameter #1 [ <optional> $word = 'Hello World' ]
Parameter #2 [ <optional> $options = Array ]
}
}
*/
$parameters = $constructor->getParameters();
var_export($parameters);
/* OUTPUT:
array (
0 =>
ReflectionParameter::__set_state(array(
'name' => 'no_default',
)),
1 =>
ReflectionParameter::__set_state(array(
'name' => 'word',
)),
2 =>
ReflectionParameter::__set_state(array(
'name' => 'options',
)),
)
*/
$nl = "\n";
echo "$nl\tParameters$nl";
foreach($parameters as $param)
{
echo "****** $" . $param->name . " ******$nl";
echo "Nullable:\t\t" . $param->allowsNull() . $nl
."Default Value:\t\t";
echo ($param->isDefaultValueAvailable()) ? $param->getDefaultValue() : "None";
echo $nl ."Is Array:\t\t";
echo ($param->isArray()) ? "Yes" : "No";
echo $nl . "Optional:\t\t";
echo ($param->isOptional()) ? "Yes" : "No";
echo $nl;
}
/* OUTPUT:
Parameters
****** $no_default ******
Nullable: 1
Default Value: None
Is Array: No
Optional: No
****** $word ******
Nullable: 1
Default Value: Hello World
Is Array: No
Optional: Yes
****** $options ******
Nullable: 1
Default Value: Array
Is Array: No
Optional: Yes
*/
?>
To clarify the possibly confusing behavior of ReflectionParemeter::isArray(), it will return true if the parameter has type hinting:
<?php
...
public function __construct($no_default, $word = "Hello World", array $options = array('a', 'b'))
...
?>
Calling isArray() will now return true for the $options parameterOld constructors also count as contructor:
<?php
class SomeClass {
function SomeClass($some_arg) {
}
}
$refl = new ReflectionClass('SomeClass');
var_dump($refl->isInstantiable()); // bool(true)
echo $refl->getConstructor();
/* OUTPUT:
Method [ <user, ctor> public method SomeClass ] {
@@ /var/www/vhosts/api.example.com/httpdocs/testRefl.php 5 - 6
- Parameters [1] {
Parameter #0 [ <required> $some_arg ]
}
}
*/
?>
Some more behavior:
<?php
class SomeClass {
function funcA($arg1, $arg2) {
}
}
$refl = new ReflectionClass('SomeClass');
var_dump($refl->isInstantiable()); // bool(true)
var_dump($refl->getConstructor()); // NULL
/* --------------- */
class AnotherClass {
private function __construct() {
}
function funcB($arg1, $arg2) {
}
}
$refl = new ReflectionClass('AnotherClass');
var_dump($refl->isInstantiable()); // bool(false)
echo $refl->getConstructor();
/*
Method [ <user, ctor> private method __construct ] {
@@ /testRefl.php 22 - 23
}
*/
?>
Tested on PHP 5.2.4