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PHP | soundex() Function
  • Last Updated : 06 May, 2018

The soundex() function is a built-in function in PHP and is used to calculate the Soundex key of a given string.

The soudex key is a four character long alphanumeric string(starting with a letter) which represents the English pronunciation of the given string.

Syntax:

string soundex($str);

Parameters: This function accepts a single parameter $str which represents the string for which we want to find the Soundex key.

Return Value: It returns the soundex key as a string.



Below programs illustrate the soundex() function in PHP:

Program 1: In the below program, the soudex() function generates the soundex key of the string “geeksforgeeks”.




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

Output:

G216

Program 2: In the below program, we will see that two words having same pronunciation produce similar Soundex key.




<?php
  
$str1 = "hair";
$str2 = "heir";
  
echo soundex($str1)."\n";
echo soundex($str2);
  
?>

Output:

H600
H600

Reference:
http://php.net/manual/en/function.soundex.php

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