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@ 2021-12-08T15:03:12Z

<?php

/**
 * This demos a (possible) bug in PHP, which is observed in PHP 5.6, 7.2, 7.3, 7.4 and 8.0 (not tested on 8.1)
 *
 * Access behaviour of a SimpleXMLElement changes if that node has a sibling.
 *
 * In this example, adding 'fiz' to 'foo' (which is the outer node) will change behaviour when accessing 'bar' (an inner node)
 */
$xml_1 = new SimpleXMLElement('<foo><bar><baz/></bar></foo>');

print_r($xml_1);        // As expected
print_r($xml_1->bar);   // As expected, $bar contains property $baz, which is an empty SimpleXMLElement

$xml_2 = new SimpleXMLElement('<foo><bar><baz/></bar><fiz/></foo>');

print_r($xml_2);        // As expected, property $bar is equal to that observed in print_r($xml_1)
print_r($xml_2->bar);   // UNEXPECTED: property $bar is an array, containing one SimpleXMLElement with property $baz which is an empty SimpleXMLElement

Output for git.master, git.master_jit, rfc.property-hooks: SimpleXMLElement Object ( [bar] => SimpleXMLElement Object ( [baz] => SimpleXMLElement Object ( ) ) ) SimpleXMLElement Object ( [baz] => SimpleXMLElement Object ( ) ) SimpleXMLElement Object ( [bar] => SimpleXMLElement Object ( [baz] => SimpleXMLElement Object ( ) ) [fiz] => SimpleXMLElement Object ( ) ) SimpleXMLElement Object ( [0] => SimpleXMLElement Object ( [baz] => SimpleXMLElement Object ( ) ) )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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