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<?php $zero = 0; // global scope $f1 = function() use ($zero) { $one = 1; // third-level closure scope of f4 $f2 = function() use ($zero, $one) { $two = 2; // second-level closure scope of f4 $f3 = function() use ($zero, $one, $two) { $three = 3; // first-level closure scope of f4 $f4 = function() use ($zero, $one, $two, $three) { $four = 4; // local scope of f4 echo $zero + $one + $two + $three + $four; }; }; }; }; $f4();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $f4 in /in/sHnEp on line 16 Fatal error: Uncaught Error: Value of type null is not callable in /in/sHnEp:16 Stack trace: #0 {main} thrown in /in/sHnEp on line 16
Process exited with code 255.

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