From: arne@vajhoej.dk   
      
   On 1/1/2026 10:44 PM, Lawrence D’Oliveiro wrote:   
   > On Thu, 1 Jan 2026 20:51:57 -0500, Arne Vajhøj wrote:   
   >   
   >> function test($v) {   
   >>       echo "B1 ($v)\n";   
   >>       $v = Fiber::suspend(123);   
   >>       echo "B2 ($v)\n";   
   >>       $v = Fiber::suspend(456);   
   >>       echo "B3 ($v)\n";   
   >>       return 789;   
   >> }   
   >>   
   >> echo "A1\n";   
   >> $ctx = new Fiber('test');   
   >> $v = $ctx->start('ABC');   
   >> echo "A2 ($v)\n";   
   >> $v = $ctx->resume('DEF');   
   >> echo "A3 ($v)\n";   
   >> $v = $ctx->resume('GHI');   
   >> if($v === null) $v = $ctx->getReturn();   
   >> echo "A4 ($v)\n";   
   >   
   > Python version (produces same sequence of output values):   
   >   
   >      def test(v) :   
   >          print("B1", v)   
   >          v = yield 123   
   >          print("B2", v)   
   >          v = yield 456   
   >          print("B3", v)   
   >          return 789   
   >      #end test   
   >   
   >      try :   
   >          print("A1")   
   >          coro = test("ABC")   
   >          v = coro.send(None)   
   >          print("A2", v)   
   >          v = coro.send("DEF")   
   >          print("A3", v)   
   >          v = coro.send("GHI")   
   >      except StopIteration as ret :   
   >          print("A4", ret.value)   
   >      #end try   
   >   
   > Note this doesn’t even need a coroutine function (async def); a simple   
   > generator will do.   
      
   PHP has generators as well.   
      
   The above could be done as:   
      
   current();   
   echo "A2 ($v)\n";   
   $ctx->send('DEF');   
   $v = $ctx->current();   
   echo "A3 ($v)\n";   
   $ctx->send('GHI');   
   $v = $ctx->getReturn();   
   echo "A4 ($v)\n";   
      
   ?>   
      
   But fibers/kp is operating at a much lower level   
   than generators that are just syntactic sugar for   
   an object with methods.   
      
   I am not sure that it matters much for Python or PHP,   
   but in C it is an entirely different execution context.   
      
   Arne   
      
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