How do you convert a PHP array to JSON format?

To convert a PHP array to JSON format, the appropriate function to use is json_encode(). This built-in function takes an array (or other data types) and converts it into a JSON string, which is a standardized format for representing data structures.

Using json_encode() is straightforward and efficient, as it handles various data types, including arrays, objects, and strings, and ensures that the output adheres to JSON syntax, allowing for the interoperability of data between systems. When you invoke json_encode() on an array, it processes the array elements and encapsulates them in the correct JSON structure.

None of the other options represent actual PHP functions, making them invalid. Therefore, json_encode() stands out as the only correct method to achieve the desired conversion from a PHP array to JSON format. This function is essential for developers working with APIs, website data exchange, or any scenario where data needs to be represented in a format that can be easily shared and consumed by other technologies.