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<?php $arr = array('11-01-2012', '01-01-2014', '01-01-2015', '09-02-2013', '01-01-2013'); function date_sort($a, $b) { return strtotime($a) - strtotime($b); } usort($arr, "date_sort"); print_r($arr);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RAYTX
function name:  (null)
number of ops:  9
compiled vars:  !0 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    6     1        INIT_FCALL                                               'usort'
          2        SEND_REF                                                 !0
          3        SEND_VAL                                                 'date_sort'
          4        DO_ICALL                                                 
    7     5        INIT_FCALL                                               'print_r'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Function date_sort:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RAYTX
function name:  date_sort
number of ops:  11
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
          1        RECV                                             !1      
    4     2        INIT_FCALL                                               'strtotime'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $2      
          5        INIT_FCALL                                               'strtotime'
          6        SEND_VAR                                                 !1
          7        DO_ICALL                                         $3      
          8        SUB                                              ~4      $2, $3
          9      > RETURN                                                   ~4
    5    10*     > RETURN                                                   null

End of function date_sort

Generated using Vulcan Logic Dumper, using php 8.0.0


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