<?php
// sql functions
//DELIMITER $$
//CREATE FUNCTION levenshtein( s1 VARCHAR(255), s2 VARCHAR(255) )
// RETURNS INT
// DETERMINISTIC
// BEGIN
// DECLARE s1_len, s2_len, i, j, c, c_temp, cost INT;
// DECLARE s1_char CHAR;
// -- max strlen=255
// DECLARE cv0, cv1 VARBINARY(256);
// SET s1_len = CHAR_LENGTH(s1), s2_len = CHAR_LENGTH(s2), cv1 = 0x00, j = 1, i = 1, c = 0;
// IF s1 = s2 THEN
// RETURN 0;
// ELSEIF s1_len = 0 THEN
// RETURN s2_len;
// ELSEIF s2_len = 0 THEN
// RETURN s1_len;
// ELSE
// WHILE j <= s2_len DO
// SET cv1 = CONCAT(cv1, UNHEX(HEX(j))), j = j + 1;
// END WHILE;
// WHILE i <= s1_len DO
// SET s1_char = SUBSTRING(s1, i, 1), c = i, cv0 = UNHEX(HEX(i)), j = 1;
// WHILE j <= s2_len DO
// SET c = c + 1;
// IF s1_char = SUBSTRING(s2, j, 1) THEN
// SET cost = 0; ELSE SET cost = 1;
// END IF;
// SET c_temp = CONV(HEX(SUBSTRING(cv1, j, 1)), 16, 10) + cost;
// IF c > c_temp THEN SET c = c_temp; END IF;
// SET c_temp = CONV(HEX(SUBSTRING(cv1, j+1, 1)), 16, 10) + 1;
// IF c > c_temp THEN
// SET c = c_temp;
// END IF;
// SET cv0 = CONCAT(cv0, UNHEX(HEX(c))), j = j + 1;
// END WHILE;
// SET cv1 = cv0, i = i + 1;
// END WHILE;
// END IF;
// RETURN c;
// END$$
//
//
//CREATE FUNCTION levenshtein_ratio( s1 VARCHAR(255), s2 VARCHAR(255) )
// RETURNS INT
// DETERMINISTIC
// BEGIN
// DECLARE s1_len, s2_len, max_len INT;
// SET s1_len = LENGTH(s1), s2_len = LENGTH(s2);
// IF s1_len > s2_len THEN
// SET max_len = s1_len;
// ELSE
// SET max_len = s2_len;
// END IF;
// RETURN ROUND((1 - LEVENSHTEIN(s1, s2) / max_len) * 100);
// END$$
//
//DELIMITER ;
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