From: mjs at beebo dot org
Operating system: Ubuntu
PHP version: 5.3.0
PHP Bug Type: Scripting Engine problem
Bug description: closures cannot import/inherit $this
Description:
------------
Attempting to import/inherit $this produces the compile-time error
"Cannot use $this as lexical variable."
Note that the workaround of assigning $this to the temporary variable
$tmp, and inheriting $tmp instead does work, so there appears to be no
limitation in the engine:
class Foo {
public function bar() {
$tmp = $this;
return function() use ($tmp) {
echo "in closure\n";
}
}
}
See also http://wiki.php.net/rfc/closures/removal-of-this. (It
appears that $this was once automatically imported into the closure's
scope, but that this turned out to be a bad idea. This bug report
concerns what happens when $this is explicitly imported, however.)
Reproduce code:
---------------
<?php
class Foo {
public function bar() {
return function() use ($this) {
echo "in closure\n";
}
}
}
Expected result:
----------------
in closure
Actual result:
--------------
PHP Fatal error: Cannot use $this as lexical variable in
/mnt/hgfs/workspace/scratch/wart2.php on line 7
--
Edit bug report at http://bugs.php.net/?id=49543&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=49543&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=49543&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=49543&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=49543&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=49543&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=49543&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=49543&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=49543&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=49543&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=49543&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=49543&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=49543&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=49543&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=49543&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=49543&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=49543&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=49543&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=49543&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=49543&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=49543&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=49543&r=mysqlcfg
