json encode sparse PHP array as JSON array not JSON object

Question

I have the following array in PHP   Array        0    gt  Array                        id    gt  0              name    gt  name1              short name    gt  n1                 2    gt  Array                        id    gt  2              name    gt  name2              short name    gt  n2               I want to JSON encode it as a JSON array  producing a string like the following                        id  0           name   name1            short name   n1                          id  2           name   name2            short name   n2            But when I call json encode on this array  I get the following            0               id  0           name   name1            short name   n1              2               id  2           name   name2            short name   n2            which is an object instead of an array   How can I get json encode to encode my array as an array  instead

User · Answer

Try this    lt  php  arr1 array  result1   gt  abcd   result2   gt  efg      arr2 array  result1   gt  hijk   result2   gt  lmn      arr3 array  arr1  arr2    print  json encode  arr3       gt

User · Answer

Array in JSON are indexed array only  so the structure you re trying to get is not valid Json Javascript   PHP Associatives array are objects in JSON  so unless you don t need the index  you can t do such conversions   If you want to get such structure you can do    indexedOnly   array     foreach   associative as  row         indexedOnly     array values  row      json encode  indexedOnly     Will returns something like           0   name1    n1          1   name2    n2

User · Answer

json decode  jsondata  true     true turns all properties to array  sequential or not

User · Answer

You are observing this behaviour because your array is not sequential - it has keys 0 and 2  but doesn t have 1 as a key   Just having numeric indexes isn t enough  json encode will only encode your PHP array as a JSON array if your PHP array is sequential - that is  if its keys are 0  1  2  3       You can reindex your array sequentially using the array values function to get the behaviour you want  For example  the code below works successfully in your use case   echo json encode array values  input

[php] json_encode sparse PHP array as JSON array, not JSON object

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