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JSON stands for JavaScript Object Notation.

JavaScript Object Notation (JSON) is a lightweight data-interchange format inspired by the object literals of JavaScript. JSON values can consist of:

  • objects (collections of name-value pairs)
  • arrays (ordered lists of values)
  • strings (in double quotes)
  • numbers
  • true, false, or null.

The decoding is handled by a parser based on the JSON_checker by Douglas Crockford.

JSON encode/decode functions have been available in PHP since version 5.2. JavaScript’s JSON stringify/parse methods are supported by all current browsers.JSON libraries and/or built-in support are provided for many other programming languages as well.

When passing data from PHP to JavaScript, the PHP json_encode function is used to return a string containing the JSON equivalent of the value passed to it. A User can then use the JavaScript JSON.parse method to safely handle the data and make it available in a form usable by JavaScript.

There are different types of function are present in JSON:

  • json_decode — This function is used to decodes a JSON string.


  • json_encode — This function is used to return the JSON representation of a value.


  • json_last_error_msg — This function is used to returns the error string of the last json_encode() or json_decode()call.


  • json_last_error — This function is used to returns the last error occurred.

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