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<?php $derp = 10; echo implode(array_keys(array_pad(array(),$derp,'')));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/eTiPE
function name:  (null)
number of ops:  14
compiled vars:  !0 = $derp
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 10
    3     1        INIT_FCALL                                               'implode'
          2        INIT_FCALL                                               'array_keys'
          3        INIT_FCALL                                               'array_pad'
          4        SEND_VAL                                                 <array>
          5        SEND_VAR                                                 !0
          6        SEND_VAL                                                 ''
          7        DO_ICALL                                         $2      
          8        SEND_VAR                                                 $2
          9        DO_ICALL                                         $3      
         10        SEND_VAR                                                 $3
         11        DO_ICALL                                         $4      
         12        ECHO                                                     $4
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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