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<?php $a = NULL; $b = explode("|", $a)[0]; echo "a{$b}a";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/u4gCo
function name:  (null)
number of ops:  12
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, null
    3     1        INIT_FCALL                                               'explode'
          2        SEND_VAL                                                 '%7C'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $3      
          5        FETCH_DIM_R                                      ~4      $3, 0
          6        ASSIGN                                                   !1, ~4
    4     7        ROPE_INIT                                     3  ~7      'a'
          8        ROPE_ADD                                      1  ~7      ~7, !1
          9        ROPE_END                                      2  ~6      ~7, 'a'
         10        ECHO                                                     ~6
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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