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<?php (function() { echo 'Foo'; })();
based on MsKnF
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/8I2lK
function name:  (null)
number of ops:  4
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2F8I2lK0x7f1551e35021'
         1        INIT_DYNAMIC_CALL                                        ~0
         2        DO_FCALL                                      0          
         3      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2F8I2lK0x7f1551e35021:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/8I2lK
function name:  {closure}
number of ops:  2
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
         0  E >   ECHO                                                     'Foo'
         1      > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2F8I2lK0x7f1551e35021

Generated using Vulcan Logic Dumper, using php 7.3.0