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<?php $a = []; $b = []; var_dump(array_diff_key($a, $b)); if (array_diff_key($a, $b)) { var_dump('true'); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 14, Position 2 = 17
Branch analysis from position: 14
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 17
filename:       /in/vFXvq
function name:  (null)
number of ops:  18
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        ASSIGN                                                   !1, <array>
    6     2        INIT_FCALL                                               'var_dump'
          3        INIT_FCALL                                               'array_diff_key'
          4        SEND_VAR                                                 !0
          5        SEND_VAR                                                 !1
          6        DO_ICALL                                         $4      
          7        SEND_VAR                                                 $4
          8        DO_ICALL                                                 
    7     9        INIT_FCALL                                               'array_diff_key'
         10        SEND_VAR                                                 !0
         11        SEND_VAR                                                 !1
         12        DO_ICALL                                         $6      
         13      > JMPZ                                                     $6, ->17
    8    14    >   INIT_FCALL                                               'var_dump'
         15        SEND_VAL                                                 'true'
         16        DO_ICALL                                                 
    9    17    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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181.58 ms | 1394 KiB | 17 Q