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similar_text
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similar_text

Name

similar_text — Calculates the similarity of two strings.

Synopsis

int similar_text(string_one, string_two[, $percent]); string string_one: First string to be compared string string_two: Second string to be compared variable $percent (optional): Variable to store the percentage similarity of the strings

Returns

Number of characters that match between the two strings

Description

similar_text() calculates the similarity of two strings. The function returns the number of unique characters that appear in both strings. The function can store the percentage similarity of the strings in the optional $percent parameter.

Version

PHP 3.0.7, PHP 4+ since 4.0b2

Example

Example 1218. A cheesy example

<?php
$term = 'cheese';
foreach(array('gouda', 'gruyere', 'cheddar') as $match) {
   echo similar_text($term, $match, $percent),
      " characters from '$term' were contained in '$match'.\n",
      "Overall, '$term' is a ", round($percent),
      "% match for '$match'\n\n";
}
?>

Output:
0 characters from 'cheese' were contained in 'gouda'.
Overall, 'cheese' is a 0% match for 'gouda'

2 characters from 'cheese' were contained in 'gruyere'.
Overall, 'cheese' is a 31% match for 'gruyere'

3 characters from 'cheese' were contained in 'cheddar'.
Overall, 'cheese' is a 46% match for 'cheddar'

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