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<?php $test = preg_replace('#[^a-z0-9]#i', '', 'test\'"€'); var_dump($test);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UaoUT
function name:  (null)
number of ops:  10
compiled vars:  !0 = $test
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'preg_replace'
          1        SEND_VAL                                                 '%23%5B%5Ea-z0-9%5D%23i'
          2        SEND_VAL                                                 ''
          3        SEND_VAL                                                 'test%27%22%E2%82%AC'
          4        DO_ICALL                                         $1      
          5        ASSIGN                                                   !0, $1
    5     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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