Bug #68654 [NEW]: empty function: late evaluation of argument

From: your dot brother dot t at hotmail dot com Operating system: Windows 8.1 64-bit PHP version: 5.6.4 Package: Scripting Engine problem Bug Type: Bug Bug description:empty function: late evaluation of argument Description: ------------ --- From manual page: http://www.php.net/function.empty --- 5.5.0 empty() now supports expressions, rather than only variables. --- The empty() can't evaluate multiple __get() results explicitly. It seems that instead of correct nesting which is left to right nesting: empty(...(((($this)->a)->b)->c)->...) It uses a right to left nesting: empty(($this->(a->(b->(c)->...)))...) Which returns null at the first left-most -> operator, yielding to an empty call to become true. Test script: --------------- <?php class Juice extends Liquid{ protected $apple; protected $orange; public function __get($name) { return $this->$name; } public function __construct($apple, $orange) { $this->apple = $apple; $this->orange = $orange; } } class Glass { protected $liquid; public function __get($name) { return $name == "liquid" ? $this->liquid : false; } public function __construct() { $this->juice = new Juice(3, 5); } } $glass = new Glass(); var_dump(empty($this->liquid)); var_dump(empty($this->liquid->apple)); var_dump(empty(($this->liquid->apple))); ?> Expected result: ---------------- bool(false) bool(false) bool(false) Actual result: -------------- bool(false) bool(true) bool(false) -- Edit bug report at https://bugs.php.net/bug.php?id=68654&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=68654&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=68654&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=68654&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=68654&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=68654&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=68654&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=68654&r=needscript Try newer version: https://bugs.php.net/fix.php?id=68654&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=68654&r=support Expected behavior: https://bugs.php.net/fix.php?id=68654&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=68654&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=68654&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=68654&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=68654&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=68654&r=dst IIS Stability: https://bugs.php.net/fix.php?id=68654&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=68654&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=68654&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=68654&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=68654&r=mysqlcfg