README.md

PHP Similar Text Percentage: Compare two strings to compute a similarity score

Library which help to Compare two strings to compute a similarity score and get stats on how linked are the strings.

Requires: PHP 5.3+

What this library exactly does?

this library can compare two strings to compute a similarity score.

It takes the text of two strings and analyze them using pure PHP code to evaluate how equal they are.

The class returns a number that represents a percentage of the two strings to tell the level of similarity.

Based on the stats provided It actually can help to detect similarity even if these cases occurred : WORD REORDER,WHITESPACE AND PUNCTUATION,REMOVE WORDS,ADD WORDS,URL STRIPPING, FORM ACRONYM,EXPAND ACRONYM,STEMMING,SUBSTRING ,SUPERSTRING,ABBREVIATION ,ANAGRAM

How to use it

Require the library by issuing this command:

composer require manuwhat/similar-text

Add require 'vendor/autoload.php'; to the top of your script.

Next, use it in your script, just like this:

use ezama/similar-text;

100.0===similarText('qwerty', 'ytrewq')

This is an example of how to use the stats to check a special case.Here we will use them to check about anagrams (note that this has already been implemented in the library check the file similar_text.php to know more about all available implementations)

function areAnagrams($a, $b)
{
	return  Ezama\similar_text::similarText($a, $b, 2, true, $check)?$check['similar'] === 100.0&&$check['contain']===true:false;
}

areAnagrams('qwerty', 'ytrewq');// return true;

Nb: some functions and methods are more subtle than one can think. For example the method simpleCommonTextSimilarities::aIsSuperStringOfB and its helper aIsSuperStringOfB are not at all equal to the usual checking functions built on top of preg_match ,stripos and PHP similar functions

a simple example is :

function aisSuperStringOfB_stripos($a, $b)
{
	return  false!==stripos($a,$b);
}

function aisSuperStringOfB_PCRE($a, $b)
{
	return  preg_match('#'.preg_quote($b).'#i',$a);
}

require './vendor/manuwhat/similar-text/similar_text.php';

aIsSuperStringOfB('mum do you want to cook something', 'do you cook something mum');//return true;
aIsSuperStringOfB_stripos('mum do you want to cook something', 'do you cook something mum');//false;
aIsSuperStringOfB_PCRE('mum do you want to cook something', 'do you cook something mum');//return false;

The library also contains common distance algorithms such unlimited string length levenshtein ,levenshtein-damerau ,jaro ,jaro-winkler ,hamming ,dice implementation

How To run unit tests

phpunit  ./tests