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<?php echo floor(((int) "15")/10)*10;
based on p8CHQ
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/SR9Fj
function name:  (null)
number of ops:  8
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'floor'
         1        CAST                                          4  ~0      '15'
         2        DIV                                              ~1      ~0, 10
         3        SEND_VAL                                                 ~1
         4        DO_ICALL                                         $2      
         5        MUL                                              ~3      $2, 10
         6        ECHO                                                     ~3
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0