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<?php echo http_build_str(['foo' => ['id' => 6]]);
based on H9rCg
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/ABKNT
function name:  (null)
number of ops:  5
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL_BY_NAME                                       'http_build_str'
         1        SEND_VAL_EX                                              <array>
         2        DO_FCALL                                      0  $0      
         3        ECHO                                                     $0
         4      > RETURN                                                   1

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