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<?php $input = ["start" => [/*"lat"=> 1.234,*/ "long"=>4.2134], "end" => ["lat"=>4.314, "long"=>51.341]]; $expectedInputStructure = ["start" => ["lat"=> 0, "long"=>0], "end" => ["lat"=>0, "long"=>0]]; var_dump(array_keys($input), $input); var_dump(array_diff_key($expectedInputStructure, $input));
based on qJdGO
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/JfGu2
function name:  (null)
number of ops:  17
compiled vars:  !0 = $input, !1 = $expectedInputStructure
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   4     1        ASSIGN                                                   !1, <array>
   5     2        INIT_FCALL                                               'var_dump'
         3        INIT_FCALL                                               'array_keys'
         4        SEND_VAR                                                 !0
         5        DO_ICALL                                         $4      
         6        SEND_VAR                                                 $4
         7        SEND_VAR                                                 !0
         8        DO_ICALL                                                 
   7     9        INIT_FCALL                                               'var_dump'
        10        INIT_FCALL                                               'array_diff_key'
        11        SEND_VAR                                                 !1
        12        SEND_VAR                                                 !0
        13        DO_ICALL                                         $6      
        14        SEND_VAR                                                 $6
        15        DO_ICALL                                                 
        16      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0