w3resource

PHP : metaphone() function

Description

The metaphone() function is used to calculate the metaphone key of a string.

Metaphone is a phonetic algorithm developed by Lawrence Philips. The algorithm produces variable length keys as its output, as opposed to Soundex's fixed-length keys. Similar sounding words share the same keys. It uses a larger set of rules for English pronunciation. Metaphone keys are very useful for text search and text matching applications.

Version:

(PHP 4 and above)

Syntax:

metaphone(input_string, key_length)

Parameter:

Name Description Required /
Optional
Type
input_string The input string. Required String
key_length Maximum length of the metaphone key. Optional Integer

Return value:

Returns the metaphone key as a string, FALSE in failure.

Value Type: String.

Pictorial Presentation

php-string-metaphone()

Example:

<?php
$str = "w3resource";
echo $str;
echo "<br />";
$str1 = "dual";
$str2 = "dwell";
echo metaphone($str1);
echo "<br />";
echo metaphone($str2);
?>

Output:

w3resource
TL
TWL

View the example in the browser

See also

PHP Function Reference

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Next: nl2br



PHP: Tips of the Day

In PHP, there are two versions of logical AND and OR operators.

Operator True if
$a and $b Both $a and $b are true
$a && $b Both $a and $b are true
$a or $b Either $a or $b is true
$a || $b Either $a or $b is true

Note that the && and || opererators have higher precedence than and and or. See table below:

Evaluation Result of $e Evaluated as
$e = false || true True $e = (false || true)
$e = false or true False ($e = false) or true

Because of this it's safer to use && and || instead of and and or.