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<?php $hi = 'ryat'; $hi = preg_replace("$expr", "", $hi); var_dump($hi);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/0Zk0S
function name:  (null)
number of ops:  12
compiled vars:  !0 = $hi, !1 = $expr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'ryat'
    5     1        INIT_FCALL                                               'preg_replace'
          2        CAST                                          6  ~3      !1
          3        SEND_VAL                                                 ~3
          4        SEND_VAL                                                 ''
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $4      
          7        ASSIGN                                                   !0, $4
    7     8        INIT_FCALL                                               'var_dump'
          9        SEND_VAR                                                 !0
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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