soundex
(PHP 4, PHP 5, PHP 7)
soundex — Calculate the soundex key of a string
Description
soundex ( string $string ) : string
Calculates the soundex key of string.
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.
Parameters
-
string -
The input string.
Return Values
Returns the soundex key as a string.
Changelog
| Version | Description |
|---|---|
| 8.0.0 | Prior to this version, calling the function with an empty string returned false for no particular reason. |
Examples
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() - Calculate Levenshtein distance between two strings
- metaphone() - Calculate the metaphone key of a string
- similar_text() - Calculate the similarity between two strings
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.soundex.php