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<?php $x = new DateTimeImmutable('2015-07-31'); $y = $x->modify('first day of -1 month'); var_dump($y); var_dump($y->setDate($y->format('Y'), $y->format('n'), 30));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fG0cf
function name:  (null)
number of ops:  26
compiled vars:  !0 = $x, !1 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $2      'DateTimeImmutable'
          1        SEND_VAL_EX                                              '2015-07-31'
          2        DO_FCALL                                      0          
          3        ASSIGN                                                   !0, $2
    5     4        INIT_METHOD_CALL                                         !0, 'modify'
          5        SEND_VAL_EX                                              'first+day+of+-1+month'
          6        DO_FCALL                                      0  $5      
          7        ASSIGN                                                   !1, $5
    6     8        INIT_FCALL                                               'var_dump'
          9        SEND_VAR                                                 !1
         10        DO_ICALL                                                 
    7    11        INIT_FCALL                                               'var_dump'
         12        INIT_METHOD_CALL                                         !1, 'setDate'
         13        INIT_METHOD_CALL                                         !1, 'format'
         14        SEND_VAL_EX                                              'Y'
         15        DO_FCALL                                      0  $8      
         16        SEND_VAR_NO_REF_EX                                       $8
         17        INIT_METHOD_CALL                                         !1, 'format'
         18        SEND_VAL_EX                                              'n'
         19        DO_FCALL                                      0  $9      
         20        SEND_VAR_NO_REF_EX                                       $9
         21        SEND_VAL_EX                                              30
         22        DO_FCALL                                      0  $10     
         23        SEND_VAR                                                 $10
         24        DO_ICALL                                                 
         25      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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