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<?php // Should not throw error? $a = ['bar' => 'baz']; unset($a['foo']); var_dump($a);
based on JTZWH
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/a5c8r
function name:  (null)
number of ops:  6
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   5     0  E >   ASSIGN                                                   !0, <array>
   7     1        UNSET_DIM                                                !0, 'foo'
   9     2        INIT_FCALL                                               'var_dump'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                                 
         5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0