PHPWales 2020 - June 3rd to June 4th

ReflectionClass::getConstructor

(PHP 5, PHP 7)

ReflectionClass::getConstructorGets the constructor of the class

Descrição

public ReflectionClass::getConstructor ( void ) : ReflectionMethod

Gets the constructor of the reflected class.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

A ReflectionMethod object reflecting the class' constructor, or NULL if the class has no constructor.

Exemplos

Exemplo #1 Basic usage of ReflectionClass::getConstructor()

<?php
$class 
= new ReflectionClass('ReflectionClass');
$constructor $class->getConstructor();
var_dump($constructor);
?>

O exemplo acima irá imprimir:

object(ReflectionMethod)#2 (2) {
  ["name"]=>
  string(11) "__construct"
  ["class"]=>
  string(15) "ReflectionClass"
}

Veja Também

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User Contributed Notes 3 notes

up
3
Rob McVey
9 years ago
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 parameter
up
0
martin dot melka at gmail dot com
5 months ago
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.
up
0
jochem at drecomm dot nl
8 years ago
Old 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
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