implement JS password scoring, td_stock approve logicc

lib/zxcvbn-php-master/src/Math/Binomial.php

@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ZxcvbnPhp\Math;
+
+use ZxcvbnPhp\Math\Impl\BinomialProviderPhp73Gmp;
+use ZxcvbnPhp\Math\Impl\BinomialProviderFloat64;
+use ZxcvbnPhp\Math\Impl\BinomialProviderInt64;
+
+class Binomial
+{
+    private static $provider = null;
+
+    private function __construct()
+    {
+        throw new \LogicException(__CLASS__ . " is static");
+    }
+
+    /**
+     * Calculate binomial coefficient (n choose k).
+     *
+     * @param int $n
+     * @param int $k
+     * @return float
+     */
+    public static function binom(int $n, int $k): float
+    {
+        return self::getProvider()->binom($n, $k);
+    }
+
+    public static function getProvider(): BinomialProvider
+    {
+        if (self::$provider === null) {
+            self::$provider = self::initProvider();
+        }
+
+        return self::$provider;
+    }
+
+    /**
+     * @return string[]
+     */
+    public static function getUsableProviderClasses(): array
+    {
+        // In order of priority.  The first provider with a value of true will be used.
+        $possibleProviderClasses = [
+            BinomialProviderPhp73Gmp::class => function_exists('gmp_binomial'),
+            BinomialProviderInt64::class    => PHP_INT_SIZE >= 8,
+            BinomialProviderFloat64::class  => PHP_FLOAT_DIG >= 15,
+        ];
+
+        $possibleProviderClasses = array_filter($possibleProviderClasses);
+
+        return array_keys($possibleProviderClasses);
+    }
+
+    private static function initProvider(): BinomialProvider
+    {
+        $providerClasses = self::getUsableProviderClasses();
+
+        if (!$providerClasses) {
+            throw new \LogicException("No valid providers");
+        }
+
+        $bestProviderClass = reset($providerClasses);
+
+        return new $bestProviderClass();
+    }
+}