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<?php $array = array("person1" => array(0 => array('k1'=>'v1', 'k2'=>'v2'), 1 => array('k1'=>'v1', 'k2'=>'v2')), "person2" => array(0 => array('k1'=>'v1', 'k2'=>'v2'), 1 => array('k1'=>'v1', 'k2'=>'v2'))); $reset_key = reset($array); $first_key = key($array); echo $reset_key[0]['k1'];
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/nnIB7
function name:  (null)
number of ops:  13
compiled vars:  !0 = $array, !1 = $reset_key, !2 = $first_key
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        INIT_FCALL                                               'reset'
          2        SEND_REF                                                 !0
          3        DO_ICALL                                         $4      
          4        ASSIGN                                                   !1, $4
    4     5        INIT_FCALL                                               'key'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                         $6      
          8        ASSIGN                                                   !2, $6
    5     9        FETCH_DIM_R                                      ~8      !1, 0
         10        FETCH_DIM_R                                      ~9      ~8, 'k1'
         11        ECHO                                                     ~9
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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