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<?php echo serialize(NULL * 0.0021); echo PHP_EOL; echo serialize(0.0021);
based on NjnbE
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/9kXPn
function name:  (null)
number of ops:  10
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'serialize'
         1        SEND_VAL                                                 0
         2        DO_ICALL                                         $0      
         3        ECHO                                                     $0
   4     4        ECHO                                                     '%0A'
   5     5        INIT_FCALL                                               'serialize'
         6        SEND_VAL                                                 0.0021
         7        DO_ICALL                                         $1      
         8        ECHO                                                     $1
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0