php - Use a class static variable as part of a closure use list -

i "use" static class variable part use list statement of closure ?

following snippets fail unexpected 'self' parse errors.

array_walk($_categories, function($c, $i) use (&self::$tree) {
or
array_walk($_categories, function($c, $i) use (self::&$tree) {

parse error: syntax error, unexpected 'self' (t_string), expecting variable (t_variable)

is there special syntax use in special case ?

why on earth want that? given use of self, closure defined within class somewhere, you're able access static member anyway:

class foo {     protected static $bar = 123;      public function test()     {         return function($x) {             static::$bar += $x; // or self::$bar             return static::$bar;         };     } }  $x = new foo; $y = $x->test();  var_dump($y(1));//int(124) var_dump($y(2));//int(126) 

no need muck references @ all...

if you're on eol'ed version of php (5.3 example), work around problem assigning reference static member first, , pass reference reference via use:

public function test() {     $staticref = &static::$bar;     return function($x) use (&$staticref) {         $staticref += $x;         return $staticref;     }; } 

but if you're still working version of php eol'ed long ago, should upgrading...