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<?php $dateStamp = "2015-06-01 00:00:00"; $datesArr = []; for ($i=1; $i<21 ; $i++) { $numMonths = $i*3; $date = new DateTime($dateStamp); $date->modify('+' . $numMonths .' month'); // or you can use '-90 day' for deduct $datesArr[] = $date->format('Y-m-d h:i:s'); } echo '<pre>'; print_r($datesArr); echo '</pre>';
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 21
Branch analysis from position: 21
2 jumps found. (Code = 44) Position 1 = 23, Position 2 = 4
Branch analysis from position: 23
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 4
2 jumps found. (Code = 44) Position 1 = 23, Position 2 = 4
Branch analysis from position: 23
Branch analysis from position: 4
filename:       /in/pk51P
function name:  (null)
number of ops:  29
compiled vars:  !0 = $dateStamp, !1 = $datesArr, !2 = $i, !3 = $numMonths, !4 = $date
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '2015-06-01+00%3A00%3A00'
    3     1        ASSIGN                                                   !1, <array>
    4     2        ASSIGN                                                   !2, 1
          3      > JMP                                                      ->21
    5     4    >   MUL                                              ~8      !2, 3
          5        ASSIGN                                                   !3, ~8
    6     6        NEW                                              $10     'DateTime'
          7        SEND_VAR_EX                                              !0
          8        DO_FCALL                                      0          
          9        ASSIGN                                                   !4, $10
    7    10        INIT_METHOD_CALL                                         !4, 'modify'
         11        CONCAT                                           ~13     '%2B', !3
         12        CONCAT                                           ~14     ~13, '+month'
         13        SEND_VAL_EX                                              ~14
         14        DO_FCALL                                      0          
    8    15        INIT_METHOD_CALL                                         !4, 'format'
         16        SEND_VAL_EX                                              'Y-m-d+h%3Ai%3As'
         17        DO_FCALL                                      0  $17     
         18        ASSIGN_DIM                                               !1
         19        OP_DATA                                                  $17
    4    20        PRE_INC                                                  !2
         21    >   IS_SMALLER                                               !2, 21
         22      > JMPNZ                                                    ~19, ->4
   10    23    >   ECHO                                                     '%3Cpre%3E'
   11    24        INIT_FCALL                                               'print_r'
         25        SEND_VAR                                                 !1
         26        DO_ICALL                                                 
   12    27        ECHO                                                     '%3C%2Fpre%3E'
         28      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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