php man page for mb_check_encoding

MB_CHECK_ENCODING(3)							 1						      MB_CHECK_ENCODING(3)

mb_check_encoding - Check if the string is valid for the specified encoding

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

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

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

	      o $encoding
		- The expected encoding.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

PHP Documentation Group 												      MB_CHECK_ENCODING(3)