Bug #53958 [NEW]: Closures can't 'use' shared variables by value and by reference

From: Operating system: Windows XP 32 PHP version: 5.3.5 Package: Scripting Engine problem Bug Type: Bug Bug description:Closures can't 'use' shared variables by value and by reference Description: ------------ When the same variable is 'used' by one closure by reference an another closure 'uses' the same variable by value, both behave like were 'using' the var by value. I think the demonstration code will help making things clear for you. Not less stranger is the fact that the order you declare the closures matters. Test script: --------------- <?php /// TEST 1 /// /// Let's define two closures. Both 'use' $a by value. /// $a = 123; $fn1 = function () use ($a) { echo $a . "\n<br />"; }; $fn2 = function () use ($a) { echo $a . "\n<br />"; }; $a = 123; $fn1 (); $fn2 (); // // Analisys: // In PHP 5.3.5 under Windows, outputs: // 123, 123 // Ok. /// /// /// TEST 3 /// // Let's repeat TEST 1, but this time both closures 'use' $a by reference. echo "---------------------------------------------------------\n<br />"; $a = 123; $fn1 = function () use (&$a) { echo $a . "\n<br />"; }; $fn2 = function () use (&$a) { echo $a . "\n<br />"; }; $a = 456; $fn1 (); $fn2 (); // // Analisys: // In PHP 5.3.5 under Windows, outputs: // 456, 456 // Ok. /// /// /// TEST 3 /// /// Let's repeat TEST 1, but this time closure 1 'uses' $a by reference /// closure 2 uses it by value. /// echo "---------------------------------------------------------\n<br />"; $a = 123; $fn1 = function () use (&$a) { echo $a . "\n<br />"; }; $fn2 = function () use ($a) { echo $a . "\n<br />"; }; $a = 456; $fn1 (); $fn2 (); // // Analisys: // In PHP 5.3.5 under Windows, outputs: // 123, 123 // Wrong! It should output 456, 123. /// /// /// TEST 4 /// /// Let's do same as in TEST 3 but now closure 1 'uses' by value and closure 2 /// 'uses' by reference. /// echo "---------------------------------------------------------\n<br />"; $a = 123; $fn1 = function () use ($a) { echo $a . "\n<br />"; }; $fn2 = function () use (&$a) { echo $a . "\n<br />"; }; $a = 456; $fn1 (); $fn2 (); // // Analisys: // In PHP 5.3.5 under Windows, outputs: // 123, 456 // Ok. What the hell? Expected result: ---------------- It should output: 123 123 --------------------------------------------------------- 456 456 --------------------------------------------------------- 456 123 --------------------------------------------------------- 123 456 Actual result: -------------- Only Test 3 fails. The others are for helping finding the problem. 123 123 --------------------------------------------------------- 456 456 --------------------------------------------------------- 123 123 --------------------------------------------------------- 123 456 -- Edit bug report at http://bugs.php.net/bug.php?id=53958&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=53958&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=53958&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=53958&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=53958&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=53958&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=53958&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=53958&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=53958&r=needscript Try newer version: http://bugs.php.net/fix.php?id=53958&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=53958&r=support Expected behavior: http://bugs.php.net/fix.php?id=53958&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=53958&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=53958&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=53958&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=53958&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=53958&r=dst IIS Stability: http://bugs.php.net/fix.php?id=53958&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=53958&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=53958&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=53958&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=53958&r=mysqlcfg