超越PHP - Exceed PHP: soundex

soundex

(PHP 3, PHP 4 , PHP 5)

soundex -- Calculate the soundex key of a string

Description

string soundex ( string str)

Calculates the soundex key of str.

Soundex keys have the property that words pronounced similarly produce the same soundex key, and can thus be used to simplify searches in databases where you know the pronunciation but not the spelling. This soundex function returns a string 4 characters long, starting with a letter.

This particular soundex function is one described by Donald Knuth in "The Art Of Computer Programming, vol. 3: Sorting And Searching", Addison-Wesley (1973), pp. 391-392.

例子 1. Soundex Examples

<?php soundex("Euler") == soundex("Ellery"); // E460 soundex("Gauss") == soundex("Ghosh"); // G200 soundex("Hilbert") == soundex("Heilbronn"); // H416 soundex("Knuth") == soundex("Kant"); // K530 soundex("Lloyd") == soundex("Ladd"); // L300 soundex("Lukasiewicz") == soundex("Lissajous"); // L222 ?>

add a note User Contributed Notes
soundex

cap at capsi dot cx
13-Dec-1999 11:16

soundex() unfortunately is very sensitive about the first character. It is
not possible to use it and have Clansy and Klansy return the same value. If
you want to do a phonetic search on such names you will still need to write
a routine to evaluate C452 as being similar to K452.

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Last updated: Fri, 22 Jun 2007