Passing an array using an HTML form hidden element

Question

I am trying to post an array in a hidden field and want to retrieve that array after submitting a form in PHP    postvalue   array  a    b    c     lt input type  hidden  name  result  value   lt  php echo  postvalue    gt   gt    But I am getting only an array string after printing the posted value  So how can I solve it

User · Answer

You can do it like this    lt input type  hidden  name  result  value   lt  php foreach  postvalue as  value  echo  postvalue        gt   gt

User · Answer

There are mainly two possible ways to achieve this    Serialize the data in some way    postvalue   serialize  array      Client side   array   unserialize   POST  result       Server side    And then you can unserialize the posted values with unserialize  postvalue   Further information on this is here in the PHP manuals   Alternativeley you can use the json encode   and json decode   functions to get a JSON formatted serialized string  You could even shrink the transmitted data with gzcompress    note that this is performance intensive  and secure the transmitted data with base64 encode    to make your data survive in non-8 bit clean transport layers  This could look like this        postvalue   base64 encode json encode  array       Client side       array   json decode base64 decode   POST  result         Server side   A not recommended way to serialize your data  but very cheap in performance  is to simply use implode   on your array to get a string with all values separated by some specified character  On the server side you can retrieve the array with explode   then  But note that you shouldn t use a character for separation that occurs in the array values  or then escape it  and that you cannot transmit the array keys with this method    Use the properties of special named input elements    postvalue       foreach   array as  v       postvalue      lt input type  hidden  name  result    value      v       gt        Like this you get your entire array in the   POST  result   variable if the form is sent  Note that this doesn t transmit array keys  However you can achieve this by using result  key  as name of each field    Everyone of these methods got their own advantages and disadvantages  What you use is mainly depending on how large your array will be  since you should try to send a minimal amount of data with all of this methods   Another way to achieve the same is to store the array in a server side session instead of transmitting it client side  Like this you can access the array over the   SESSION variable and don t have to transmit anything over the form  For this have a look at a basic usage example of sessions on php net

User · Answer

Use    postvalue   array  a    b    c    foreach  postvalue as  value        echo   lt input type  hidden  name  result    value      value     gt        And you will get   POST  result   as an array   print r   POST  result

User · Answer

You can use serialize and base64 encode from the client side  After that  then use unserialize and base64 decode on the server side   Like   On the client side  use        postvalue   array  a    b    c         postvalue   base64 encode serialize  array           Your form hidden input     lt input type  hidden  name  result  value   lt  php echo  postvalue    gt   gt    On the server side  use        postvalue   unserialize base64 decode   POST  result          print r  postvalue     Your desired array data will be printed here

User · Answer

lt input type  hidden  name  item    value   anyvalue   gt    Let it be in a repeated mode it will post this element in the form as an array and use the   print r   POST  item      To retrieve the item

User · Answer

If you want to post an array you must use another notation   foreach   postvalue as  value    lt input type  hidden  name  result    value   value   gt      in this way you have three input fields with the name result   and when posted   POST  result   will be an array

User · Answer

Either serialize    postvalue array  a   b   c     lt input type  hidden  name  result  value   lt  php echo serialize  postvalue     gt   gt    on receive  unserialize   POST  result     Or implode    postvalue array  a   b   c     lt input type  hidden  name  result  value   lt  php echo implode       postvalue     gt   gt    On receive  explode        POST  result

User · Answer

It s better to encode first to a JSON string and then encode with Base64  for example  on the server side in reverse order  use first the base64 decode and then json decode functions  So you will restore your PHP array

[php] Passing an array using an HTML form hidden element

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