All 7 JSON Handling in PHP questions
More in JSON Handling in PHP
How do you convert a JSON formatted string back into a PHP array or object using json_decode? How do you properly handle errors when parsing potentially invalid JSON, and how does the JSON_THROW_ON_ERROR flag simplify this compared to manually checking json_last_error? How do you control the depth and formatting of json_encode output, such as pretty printing JSON for readability or handling deeply nested data structures? How can PHP objects implementing the JsonSerializable interface customize exactly how they are converted into JSON when passed to json_encode? How should an API validate the structure and types of incoming JSON data to ensure it matches the expected schema before processing it further? What performance considerations arise when working with very large JSON payloads in PHP, and how do streaming JSON parsers help address them?
Advertisement
PHP › JSON Handling in PHP

How do you convert a PHP array or object into a JSON formatted string using json_encode?

Beginner

Answer

The json_encode function converts a PHP array or object into a JSON formatted string, which is the standard, widely used data format for exchanging information between different systems, such as sending a response from a PHP API to a JavaScript based frontend, and it automatically handles converting PHP's native data types, like arrays, strings, and booleans, into their correct corresponding JSON representations.
$data = ['name' => 'Ali', 'age' => 30];
echo json_encode($data);
Real-world example An API endpoint uses json_encode to convert an array of product data retrieved from the database into a JSON response, which the frontend JavaScript application then parses to display the products on the page.

Common follow-ups: How do you make json_encode produce nicely formatted, indented output?;What happens if the array you are encoding contains a resource type that cannot be represented in JSON?

RESTful API Development with PHP;Arrays in PHP
All 7 JSON Handling in PHP questions