how to use JSON stringify and json decode properly

Question

Im trying to pass a mulitidimensional Javascript array to another page on my site by    using JSON stringify on the array assigning the resultant value to an input field posting that field to the second page using json decode on the posted value then var dump to test  echo ing the posted variable directly just to see if it came through at all    Javascript on page one   var JSONstr   JSON stringify fullInfoArray   document getElementById  JSONfullInfoArray   value  JSONstr    php on page two    data   json decode   POST  JSONfullInfoArray     var dump  data    echo   POST  JSONfullInfoArray       The echo works fine but the var dump returns NULL  What have I done wrong     This got me fixed up    postedData     POST  JSONfullInfoArray     tempData   str replace           postedData    cleanData   json decode  tempData   var dump  cleanData     Im not sure why but the post was coming through with a bunch of     characters separating each variable in the string   Figured it out using json last error   as sugested by Bart which returned JSON ERROR SYNTAX

User · Answer

I don t how this works  but it worked    post data   json decode json encode   POST  request key

User · Answer

When you use JSON stringify then use html entity decode first before json decode     tempData   html entity decode  tempData    cleanData   json decode  tempData

User · Answer

jsonText     REQUEST  myJSON      decodedText   html entity decode  jsonText     myArray   json decode  decodedText  true

User · Answer

stripslashes htmlspecialchars JSON DATA

User · Answer

You ll need to check the contents of   POST  JSONfullInfoArray    If something doesn t parse json decode will just return null  This isn t very helpful so when null is returned you should check json last error   to get more info on what went wrong

User · Answer

When you save some data using JSON stringify   and then need to read that in php  The following code worked for me   json decode  html entity decode  stripslashes   jsonString          Thanks to  Thisguyhastwothumbs

User · Answer

None of the other answers worked in my case  most likely because the JSON array contained special characters   What fixed it for me   Javascript  added encodeURIComponent   var JSONstr   encodeURIComponent JSON stringify fullInfoArray    document getElementById  JSONfullInfoArray   value   JSONstr    PHP  unchanged from the question    data   json decode   POST  JSONfullInfoArray     var dump  data    echo   POST  JSONfullInfoArray       Both echo and var dump have been verified to work fine on a sample of more than 2000 user-entered datasets that included a URL field and a long text field  and that were returning NULL on var dump for a subset that included URLs with the characters   amp

[php] how to use JSON.stringify and json_decode() properly

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