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<?php var_dump(preg_replace('/(\s)\s+/u', '$1', html_entity_decode(' &nbsp; ', ENT_QUOTES, 'utf-8')));
based on jiP9W
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/HDZG6
function name:  (null)
number of ops:  14
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'preg_replace'
         2        SEND_VAL                                                 '%2F%28%5Cs%29%5Cs%2B%2Fu'
         3        SEND_VAL                                                 '%241'
         4        INIT_FCALL                                               'html_entity_decode'
         5        SEND_VAL                                                 '+%26nbsp%3B+'
         6        SEND_VAL                                                 3
         7        SEND_VAL                                                 'utf-8'
         8        DO_ICALL                                         $0      
         9        SEND_VAR                                                 $0
        10        DO_ICALL                                         $1      
        11        SEND_VAR                                                 $1
        12        DO_ICALL                                                 
        13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0