Multibyte String Functions
PHP Manual

mb_check_encoding

Check if the string is valid for the specified encoding

Description

bool mb_check_encoding ([ string $var = NULL [, string $encoding = mb_internal_encoding() ]] )

Checks if the specified byte stream is valid for the specified encoding. It is useful to prevent so-called "Invalid Encoding Attack".

Parameters

var

The byte stream to check. If it is omitted, this function checks all the input from the beginning of the request.

encoding

The expected encoding.

Return Values

Returns TRUE on success or FALSE on failure.