(PHP 4, PHP 5, PHP 7, PHP 8)
metaphone — Calculate the metaphone key of a string
$max_phonemes= 0): string
Calculates the metaphone key of
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 at verity dot com>. It is described in ["Practical Algorithms for Programmers", Binstock & Rex, Addison Wesley, 1995].
The input string.
This parameter restricts the returned metaphone key to
max_phonemes characters in length.
However, the resulting phonemes are always transcribed completely, so the
resulting string length may be slightly longer than
The default value of
0 means no restriction.
Returns the metaphone key as a string.
The function returned
示例 #1 metaphone() basic example
string(7) "PRKRMNK" string(6) "PRKRMR"
示例 #2 Using the
string(5) "PRKRM" string(5) "PRKRM"
示例 #3 Using the
In this example, metaphone() is advised to produce a string
of five characters, but that would require to split the final phoneme
'x' is supposed to be transcribed to
so the function returns a string with six characters.