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<?php $fieldvalue[0] = false; if (isset($fieldvalue[0]) and $fieldvalue[0] === false) { echo 'false is true'; }
based on eHp9o
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = 4, Position 2 = 7
Branch analysis from position: 4
Jump found. Position 1 = 8, Position 2 = 9
Branch analysis from position: 8
Jump found. Position 1 = -2
Branch analysis from position: 9
Branch analysis from position: 7
filename:       /in/32TpL
function name:  (null)
number of ops:  10
compiled vars:  !0 = $fieldvalue
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN_DIM                                               !0, 0
         1        OP_DATA                                                  <false>
   5     2        ISSET_ISEMPTY_DIM_OBJ                       33554432  ~2      !0, 0
         3      > JMPZ_EX                                          ~2      ~2, ->7
         4    >   FETCH_DIM_R                                      $3      !0, 0
         5        IS_IDENTICAL                                     ~4      $3, <false>
         6        BOOL                                             ~2      ~4
         7    > > JMPZ                                                     ~2, ->9
   7     8    >   ECHO                                                     'false+is+true'
         9    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0