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                                    soundex

   (PHP 3, PHP 4 )
   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.

   Example 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
   ?>

   See also levenshtein(), metaphone(), and similar_text().
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