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<?php $date = new DateTime('2015-01-10'); echo $date->modify('last day of this month')->format('Y-m-d');
based on rDGNQ
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/G9d93
function name:  (null)
number of ops:  12
compiled vars:  !0 = $date
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NEW                                              $1      :-5
         1        SEND_VAL_EX                                              '2015-01-10'
         2        DO_FCALL                                      0          
         3        ASSIGN                                                   !0, $1
   4     4        INIT_METHOD_CALL                                         !0, 'modify'
         5        SEND_VAL_EX                                              'last+day+of+this+month'
         6        DO_FCALL                                      0  $4      
         7        INIT_METHOD_CALL                                         $4, 'format'
         8        SEND_VAL_EX                                              'Y-m-d'
         9        DO_FCALL                                      0  $5      
        10        ECHO                                                     $5
        11      > RETURN                                                   1

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