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@ 2017-06-08T05:27:39Z

<?php

$classes = array('DateInterval', 'DateTimeImmutable', 'DateTime', 'DateTimeZone');

foreach ($classes as $class){ 
    echo "Signature of $class::_set_state\n";
    try{
        $rm = new ReflectionMethod($class, '__set_state');
        var_dump($rm->getNumberOfParameters());
        var_dump($rm->getNumberOfRequiredParameters());
    } catch(Exception $e) {
        echo "$class: " . $e;
    }
}


echo "End of param counts for __set_state\n\n";
try {
var_export(DateTime::__set_state(array(
   'date' => '2017-06-08 05:11:40.907706',
   'timezone_type' => 3,
   'timezone' => 'UTC',
)));
} catch(Error $e) {
    echo "Couldn't call DateTime::__set_state: " . $e . "\n";
}
//  DateTime::__set_state();  // would trigger Warning: DateTime::__set_state() expects exactly 1 parameter, 0 given in php shell code on line 1


// needs 2, datefmt and bool, according to docs (not 100% sure)
echo "datefmt_set_lenient\n";
$rf = new ReflectionFunction('datefmt_set_lenient');
var_dump($rf->getNumberOfParameters());
var_dump($rf->getNumberOfRequiredParameters());

Output for git.master, git.master_jit, rfc.property-hooks: Signature of DateInterval::_set_state int(1) int(1) Signature of DateTimeImmutable::_set_state int(1) int(1) Signature of DateTime::_set_state int(1) int(1) Signature of DateTimeZone::_set_state int(1) int(1) End of param counts for __set_state \DateTime::__set_state(array( 'date' => '2017-06-08 05:11:40.907706', 'timezone_type' => 3, 'timezone' => 'UTC', ))datefmt_set_lenient int(2) int(2)

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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