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<?php $recipients = [ "kumar", "ram@test.com", "ravi", "rob@example.com" ]; echo implode( ', ', preg_replace( '/^[^@]+$/', '$0@test.com', $recipients ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ABCI9
function name:  (null)
number of ops:  6
compiled vars:  !0 = $recipients
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, <array>
   12     1        FRAMELESS_ICALL_3                preg_replace        ~2      '%2F%5E%5B%5E%40%5D%2B%24%2F', '%240%40test.com'
   15     2        OP_DATA                                                      !0
   10     3        FRAMELESS_ICALL_2                implode             ~3      '%2C+', ~2
   15     4        ECHO                                                         ~3
   17     5      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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