Using JSON in PHP: json_encode and json_decode Explained with Examples
This article explains the fundamentals of JSON, its syntax rules, and demonstrates how PHP's json_encode and json_decode functions convert between arrays and JSON strings, including examples of sequential, non‑sequential, and multidimensional arrays, and the effect of the associative‑array option.
JSON is a lightweight data-interchange format widely used in network communication, supported by almost all programming languages.
The article outlines the basic syntax rules of JSON: key‑value pairs, comma separation, curly braces for objects, and square brackets for arrays.
In PHP, the json_encode() function converts arrays to JSON strings. Example code demonstrates encoding a sequential array, a non‑sequential array, the effect of unsetting an element, and encoding a two‑dimensional array:
When encoding a two‑dimensional array, the outermost JSON structure is an array (enclosed in square brackets) containing the JSON representations of each inner array.
The json_decode() function parses JSON strings back into PHP variables. By default it returns an object; passing true as the second argument returns an associative array. Example code shows decoding a JSON string to an object and to an array:
The article concludes that setting the second parameter of json_decode() to true converts JSON data into an array.
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