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<?php echo date('d',strtotime('last day of 2008-07'));
based on iXZRV
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/G7dpc
function name:  (null)
number of ops:  9
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'date'
         1        SEND_VAL                                                 'd'
         2        INIT_FCALL                                               'strtotime'
         3        SEND_VAL                                                 'last+day+of+2008-07'
         4        DO_ICALL                                         $0      
         5        SEND_VAR                                                 $0
         6        DO_ICALL                                         $1      
         7        ECHO                                                     $1
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0