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<?php $str = preg_replace('/(\w)(\W*)(\w)?/e', "strtoupper('$1').strtolower('$3')", 'test example.Hello World abc'); echo $str; ?>
based on NCk2Z
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/MWI9Y
function name:  (null)
number of ops:  8
compiled vars:  !0 = $str
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'preg_replace'
         1        SEND_VAL                                                 '%2F%28%5Cw%29%28%5CW%2A%29%28%5Cw%29%3F%2Fe'
         2        SEND_VAL                                                 'strtoupper%28%27%241%27%29.strtolower%28%27%243%27%29'
         3        SEND_VAL                                                 'test+example.Hello+World+abc'
         4        DO_ICALL                                         $1      
         5        ASSIGN                                                   !0, $1
   3     6        ECHO                                                     !0
         7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0