Re: RFC: Support for multi-line arrow functions

On Mon, Oct 5, 2020 at 5:09 AM Lynn <kjarli@gmail.com> wrote: > How should php deal with the scenario where you want to use > everything > and have one variable by reference? > > ``` > function () use (*, &$butNotThisOne) {}; > ``` I would take a page out of C++'s book here. In C++ a closure is (some of these bits can be omitted for brevity, but I'm not going to describe those here as it's orthogonal to the topic): [capture, vars](type argName) -> returnType { statements; return retVal; } Looking specifically at the capture vars section (in the example we are capturing two variables, one named 'capture', one named 'vars'), there are wildcards available as well: [=](bool bval) -> void {} The equal sign (as above) captures all variables used in the closure by value. Similarly, the ampersand [&](int ival) -> void {} captures all variables used by reference. Exceptions can be added to that list just as you suggested, so: [=,&foo](double dval) -> double { return foo + dval; } Or [&,foo]() -> void { doSomething(foo); } I think we could apply the same in PHP terms: function(float $dval) use ($, &$foo) { return $foo + $dval; }; function() use (&$, $foo) { doSomething($foo); }; Plus or minor for parser convenience. -Sara