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Calculate the soundex key of a string (PHP 4, PHP 5)
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.



The input string.

Return Values

Returns the soundex key as a string.


Example 2431. Soundex Examples

("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