Understanding PHP's mb_http_input() Function: Detecting HTTP Input Character Encoding

The PHP function mb_http_input() is used to detect the character encoding of HTTP input data such as GET, POST, COOKIE, or raw input strings.

mixed mb_http_input([string $type] = "")

Explanation: When called, the function examines the specified input type and returns the encoding name for that input. If no type is provided, it returns the encoding of the last processed input type.

Parameter description:

type – a string that specifies which input to check: "G" for GET, "P" for POST, "C" for COOKIE, "S" for a string, "L" for a list, and "I" for the entire list (which returns an array).

If the type argument is omitted, the function returns the encoding of the most recent input type that was processed.

Return value: The function returns the character encoding name for each requested type. If mb_http_input() has not processed any of the specified HTTP inputs, it returns FALSE .

Note: This function is rarely needed in typical PHP applications, but it can be useful for debugging or handling non‑UTF‑8 input data.