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PHP soundex() Function

Complete PHP String Reference

Definition and Usage

The soundex() function calculates the soundex key of a string.

A soundex key is a four character long alphanumeric string that represent English pronunciation of a word.

The soundex() function can be used for spelling applications.

This function returns the soundex key of the string on success, or FALSE on failure.

Syntax

soundex(string)

Parameter	Description
string	Required. Specifies the string to check

Tips and Notes

Note: The soundex() function creates the same key for similar sounding words.

Tip: metaphone() is more accurate than soundex(), because metaphone() knows the basic rules of English pronunciation.

Example 1

<?php
$str = "hello";
echo soundex($str);
?>

The output of the code above will be:

H400

Example 2

In this example we use the soundex() function on two similar sounding words:

<?php
$str = "Sun";
$str2 = "Son";

echo soundex($str);
echo "<br />";
echo soundex($str2);
?>