yarri/password-strength-analyzer

Scores password strength from 0% to 100%, penalizing repeated patterns and consecutive character sequences.

v0.1.4 2026-04-08 14:17 UTC

Requires

• php: >=5.6.0
• atk14/string4: ^0.5

Requires (Dev)

• atk14/tester: *

MIT

• Jaromir Tomek

• password
• analyze
• strength
• score

README

Scores password strength from 0% to 100%, penalizing repeated patterns and consecutive character sequences. Unicode and diacritics are supported.

Usage

$analyzer = new Yarri\PasswordStrengthAnalyzer();
$score = $analyzer->analyze("someFAIRpasswd"); // 26

Passwords with letters, numbers, and symbols are rated high.

echo $analyzer->analyze("SomW2!3RE#"); // 91

Letter-only passwords can also score high if they are long enough.

echo $analyzer->analyze("someBOYS"); // 9
echo $analyzer->analyze("someBOYSdontCRY"); // 38
echo $analyzer->analyze("someBOYSdontCRYmuch"); // 71

But not all long passwords are rated high.

echo $analyzer->analyze("somesomesomesomesomesome"); // 4

Groups of 3 or more consecutive characters have a negative impact on the final score.

echo $analyzer->analyze("Secret18239!"); // 58
echo $analyzer->analyze("Secret12345!"); // 45
echo $analyzer->analyze("Secret76543!"); // 45

echo $analyzer->analyze("OpenAFBGCED!"); // 42
echo $analyzer->analyze("OpenABCDEFG!"); // 30

Use getCoefficients() to inspect the individual scoring factors after an analysis:

$analyzer->analyze("SomW2!3RE#"); // 91
print_r($analyzer->getCoefficients());
// [
//   'unique_chars'      => 2,
//   'password_length'   => 1,
//   'types_used'        => 1.0125,
//   'type_transitions'  => 0.8958,
//   'simplicity_factor' => 1,
// ]

Installation

Use Composer:

composer require yarri/password-strength-analyzer

Live testing

In the package, there is a script runnable in shell which can be used for live testing.

$ php test/test_cli.php

initial score: 50%
coefficients:
* unique_chars: 1.8
* password_length: 1.2
* types_used: 0.675
* type_transitions: 0.7465
* simplicity_factor: 1
FINAL SCORE: 54%
password: THISisS3CR3T

License

PasswordStrengthAnalyzer is free software distributed under the terms of the MIT license