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<?php $date = new DateTime('2012-03-30'); $date->modify("last day of last month"); var_dump($date->format('Y-m-d')); // correctly last day of Feb $date->setDate(2012, 1, 30); var_dump($date->format('Y-m-d')); // incorrect date $date->modify('2012-01-30'); var_dump($date->format('Y-m-d')); // does set correct date
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ATGLp
function name:  (null)
number of ops:  34
compiled vars:  !0 = $date
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    2     0  E >   NEW                                                  $1      'DateTime'
          1        SEND_VAL_EX                                                  '2012-03-30'
          2        DO_FCALL                                          0          
          3        ASSIGN                                                       !0, $1
    4     4        INIT_METHOD_CALL                                             !0, 'modify'
          5        SEND_VAL_EX                                                  'last+day+of+last+month'
          6        DO_FCALL                                          0          
    5     7        INIT_FCALL                                                   'var_dump'
          8        INIT_METHOD_CALL                                             !0, 'format'
          9        SEND_VAL_EX                                                  'Y-m-d'
         10        DO_FCALL                                          0  $5      
         11        SEND_VAR                                                     $5
         12        DO_ICALL                                                     
    7    13        INIT_METHOD_CALL                                             !0, 'setDate'
         14        SEND_VAL_EX                                                  2012
         15        SEND_VAL_EX                                                  1
         16        SEND_VAL_EX                                                  30
         17        DO_FCALL                                          0          
    8    18        INIT_FCALL                                                   'var_dump'
         19        INIT_METHOD_CALL                                             !0, 'format'
         20        SEND_VAL_EX                                                  'Y-m-d'
         21        DO_FCALL                                          0  $8      
         22        SEND_VAR                                                     $8
         23        DO_ICALL                                                     
   10    24        INIT_METHOD_CALL                                             !0, 'modify'
         25        SEND_VAL_EX                                                  '2012-01-30'
         26        DO_FCALL                                          0          
   11    27        INIT_FCALL                                                   'var_dump'
         28        INIT_METHOD_CALL                                             !0, 'format'
         29        SEND_VAL_EX                                                  'Y-m-d'
         30        DO_FCALL                                          0  $11     
         31        SEND_VAR                                                     $11
         32        DO_ICALL                                                     
         33      > RETURN                                                       1

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