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<?php var_dump(base64_decode("\0YW55dGhpbmc=", true)); var_dump(base64_decode("YW55dGhpbmc=\0", true)); var_dump(base64_decode("YW55\0dGhpbmc=", true));
based on A7qCT
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/H9shC
function name:  (null)
number of ops:  22
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'base64_decode'
         2        SEND_VAL                                                 '%00YW55dGhpbmc%3D'
         3        SEND_VAL                                                 <true>
         4        DO_ICALL                                         $0      
         5        SEND_VAR                                                 $0
         6        DO_ICALL                                                 
   4     7        INIT_FCALL                                               'var_dump'
         8        INIT_FCALL                                               'base64_decode'
         9        SEND_VAL                                                 'YW55dGhpbmc%3D%00'
        10        SEND_VAL                                                 <true>
        11        DO_ICALL                                         $2      
        12        SEND_VAR                                                 $2
        13        DO_ICALL                                                 
   5    14        INIT_FCALL                                               'var_dump'
        15        INIT_FCALL                                               'base64_decode'
        16        SEND_VAL                                                 'YW55%00dGhpbmc%3D'
        17        SEND_VAL                                                 <true>
        18        DO_ICALL                                         $4      
        19        SEND_VAR                                                 $4
        20        DO_ICALL                                                 
        21      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0