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Bug #62643 Wrong percentage similarity
Submitted: 2012-07-23 18:14 UTC Modified: 2013-12-05 17:09 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: funnyoz at hotmail dot fr Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.4.5 OS: Windows
Private report: No CVE-ID: None
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 [2012-07-23 18:14 UTC] funnyoz at hotmail dot fr 
Description:
------------
If you need the function 'similar_text' to calculate the similarity in percentage between two strings, the order is important, while it must not be.

(see the Test script for more information)

---
From manual page: http://www.php.net/function.similar-text
---


Test script:
---------------
$var_1 = 'PHP IS GREAT';
$var_2 = 'WITH MYSQL';

similar_text($var_1, $var_2, $percent);

echo $percent;
// 27.272727272727

similar_text($var_2, $var_1, $percent);

echo $percent;
// 18.181818181818


Expected result:
----------------
I expect both the echo's to print :
27.272727272727

Actual result:
--------------
The first echo prints :
27.272727272727

The second :
18.181818181818

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 [2013-12-05 17:09 UTC] mike@php.net
-Status: Open +Status: Not a bug
 [2013-12-05 17:09 UTC] mike@php.net 
It should probably rather read: "the similarity of string b to string a"

If you need a consistent result, instead of how much of string a is in string b:

$percent = 100*similar_string($a,$b)/max(strlen($a),strlen($b));
 
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