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# Metaphone

Metaphone -- Calculate the metaphone key of a string.

## Description

`string metaphone`(string str);

Calculates the metaphone key of `str`.

Similar to soundex() metaphone creates the same key for similar sounding words. It's more accurate than soundex() as it knows the basic rules of English pronunciation. The metaphone generated keys are of variable length.

Metaphone was developed by Lawrence Philips <lphilips@verity.com>. It is described in ["Practical Algorithms for Programmers", Binstock & Rex, Addison Wesley, 1995].

> Note: This function was added in PHP 4.0.

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