soundex
(PHP 4, PHP 5, PHP 7, PHP 8)
soundex — Calculate the soundex key of a string
Description
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 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 with four characters.
If at least one letter is contained in string, the returned
string starts with a letter. Otherwise "0000" is returned.
Examples
Example #1 Soundex Examples
<?php
echo soundex("Euler"), PHP_EOL, soundex("Ellery"), PHP_EOL;
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
?>
similar_text
String Functions