ReflectionClass::newInstance
Annoyingly, this will throw an exception for classes with no constructor even if you pass an empty array for the arguments. For generic programming you should avoid this function and use call_user_func_array with newInstance.
ReflectionClass::newInstanceArgs
(PHP 5 >= 5.1.3)
ReflectionClass::newInstanceArgs — Creates a new cass instance from given arguments.
Description
public object ReflectionClass::newInstanceArgs
([ array $args
] )
Creates a new cass instance of the class, the given arguments are passed to the class constructor.
Warning
This function is currently not documented; only its argument list is available.
Return Values
Returns a new instance of the class.
Errors/Exceptions
A ReflectionException if the class constructor is not public.
A ReflectionException if the class does not have a constructor and the args parameter contains one or more parameters.
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User Contributed NotesReflectionClass::newInstanceArgs
sausage at tehsausage dot com
21-Aug-2010 01:14
21-Aug-2010 01:14
sarfraznawaz2005 at gmail dot com
15-Dec-2009 08:31
15-Dec-2009 08:31
I use reflection class and also detect whether arguments are passed by reference or passed by value
and then initiate/call the method successfully with those arguments:
<?php
if (count($args) > 1)
{
if (method_exists($class_name, '__construct') === false)
{
exit("Constructor for the class <strong>$class_name</strong> does not exist, you should not pass arguments to the constructor of this class!");
}
$refMethod = new ReflectionMethod($class_name, '__construct');
$params = $refMethod->getParameters();
$re_args = array();
foreach($params as $key => $param)
{
if ($param->isPassedByReference())
{
$re_args[$key] = &$args[$key];
}
else
{
$re_args[$key] = $args[$key];
}
}
$refClass = new ReflectionClass($class_name);
$class_instance = $refClass->newInstanceArgs((array) $re_args);
}
?>
kevinpeno at gmail dot com
16-Sep-2009 05:11
16-Sep-2009 05:11
I misunderstood this function to be a sort of setter of Reflection::newInstance() arguments in an array form rather than a creator of new instances itself.
This function is equivilant to call_user_func_array() while Reflection::newInstance() is equivilant to call_user_func()
richardcook at gmail dot com
12-Apr-2009 11:39
12-Apr-2009 11:39
the newInstanceArgs function cannot call a class' constructor if it has references in its arguments, so be careful what you pass into it:
<?php
class Foo {
function __construct (&$arr) {
$this->arr = &$arr;
}
function createInstance () {
$reflectionClass = new ReflectionClass("Bar");
return $reflectionClass->newInstanceArgs(array($this, $this->arr));
}
function mod($key, $val) {
$this->arr[$key] = $val;
}
}
class Bar {
function __construct (&$foo, &$arr) {
$this->foo = &$foo;
$this->arr = &$arr;
}
function mod($key, $val) {
$this->arr[$key] = $val;
}
}
$arr = array();
$foo = new Foo($arr);
$arr["x"] = 1;
$foo->mod("y", 2);
$bar = $foo->createInstance();
$bar->mod("z", 3);
echo "<pre>";
print_r($arr);
print_r($foo);
print_r($bar);
echo "</pre>";
/*
Output:
Warning: Invocation of Bar's constructor failed in [code path] on line 31
Fatal error: Call to a member function mod() on a non-object in [code path] on line 58
*/
?>
gromit at mailinator dot com
29-Jul-2008 10:37
29-Jul-2008 10:37
Be aware that calling the method newInstanceArgs with an empty array will still call the constructor with no arguments. If the class has no constructor then it will generate an exception.
You need to check if a constructor exists before calling this method or use try and catch to act on the exception.