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<?php $t = false; $t1 = 'false'; VAR_DUMP(filter_var( 'false', FILTER_VALIDATE_BOOLEAN));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QlKIf
function name:  (null)
number of ops:  10
compiled vars:  !0 = $t, !1 = $t1
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <false>
    4     1        ASSIGN                                                   !1, 'false'
    7     2        INIT_FCALL                                               'var_dump'
          3        INIT_FCALL                                               'filter_var'
          4        SEND_VAL                                                 'false'
          5        SEND_VAL                                                 258
          6        DO_ICALL                                         $4      
          7        SEND_VAR                                                 $4
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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