variable_symbol Class Reference

Static Public Member Functions
static	crc16 ($data)
	CRC-CCITT-16 algorithm for the polynomial 0x1021.
static	make_variable_symbol ($member_id)
	This function can be used for generating variable symbols from member id.

Member Function Documentation

static variable_symbol::crc16 (   $data )

static

CRC-CCITT-16 algorithm for the polynomial 0x1021.

Tomas Dulik note: the algorithm is too nice to be true. The values it computes differ from the values returned by other calculators, e.g. http://zorc.breitbandkatze.de/crc.html

This function can be used for generating the payments variable symbol from member id. crc16 can check error bursts up to 16bits long, so if the member mistypes such a generated variable symbol, almost any possible error should be detected.

Author

Tomas Dulik, using http://us3.php.net/manual/en/function.crc32.php#86628

Parameters

$data

16bit integer for which crc16 should be computed

Returns

16bit int value containing crc16

static variable_symbol::make_variable_symbol (   $member_id )

static

This function can be used for generating variable symbols from member id.

Author

Tomas Dulik

Parameters

integer

$member_id

Returns

string containing concatenation of member_id and 5 digits of its crc16

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The documentation for this class was generated from the following file:

• helpers/variable_symbol.php