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<?php $spfdata='v=spf1 mx 1.2.3.4 ~all'; if (preg_match('/^v=spf[a-z0-9~?\s.-]+$/i', $spfdata)){ echo "SPF seems to be ok"; } else { echo "Invalid syntax"; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 5
Branch analysis from position: 3
1 jumps found. (Code = 42) Position 1 = 6
Branch analysis from position: 6
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 5
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/mYXjs
function name:  (null)
number of ops:  7
compiled vars:  !0 = $spfdata
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, 'v%3Dspf1+mx+1.2.3.4+%7Eall'
    5     1        FRAMELESS_ICALL_2                preg_match          ~2      '%2F%5Ev%3Dspf%5Ba-z0-9%7E%3F%5Cs.-%5D%2B%24%2Fi', !0
          2      > JMPZ                                                         ~2, ->5
    6     3    >   ECHO                                                         'SPF+seems+to+be+ok'
    5     4      > JMP                                                          ->6
    8     5    >   ECHO                                                         'Invalid+syntax'
    9     6    > > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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