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<?php $fileNamePattern = "/^[a-z0-9\_\-\.\/\\\]+\.php$/i"; var_dump(preg_match($fileNamePattern, ['not a string']));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MeoBt
function name:  (null)
number of ops:  6
compiled vars:  !0 = $fileNamePattern
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '%2F%5E%5Ba-z0-9%5C_%5C-%5C.%5C%2F%5C%5C%5D%2B%5C.php%24%2Fi'
    5     1        INIT_FCALL                                                   'var_dump'
          2        FRAMELESS_ICALL_2                preg_match          ~2      !0, <array>
          3        SEND_VAL                                                     ~2
          4        DO_ICALL                                                     
          5      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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