Online PHP editor | output for 0EGhe

@ 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 7.3.13 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: 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 ( ) ) )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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 ( ) ) )

preferences:dark modelive preview