fluentform / vendor / wpfluent / framework / src / WPFluent / Randomizer / Randomizer.php

Randomizer.php in Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder 6.2.2, at vendor/wpfluent/framework/src/WPFluent/Randomizer/Randomizer.php

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1	<?php
2
3	namespace FluentForm\Framework\Randomizer;
4
5	use Exception;
6	use FluentForm\Framework\Support\InvalidArgumentException;
7
8	/**
9	* An implementation of the Randomizer class.
10	* @see https://www.php.net/manual/en/class.random-randomizer.php
11	*/
12	if (class_exists('Random\Randomizer')) {
13	final class Randomizer
14	{
15	use GetStringTrait;
16
17	private $randomizer;
18
19	public function __construct()
20	{
21	// @phpstan-ignore-next-line
22	$this->randomizer = new \Random\Randomizer();
23	}
24
25	public function getBytesFromString(string $string, int $length): string
26	{
27	return $this->randomizer->getBytesFromString($string, $length);
28	}
29
30	public function __call($method, $args = [])
31	{
32	return $this->randomizer->{$method}(...$args);
33	}
34	}
35	} else {
36	final class Randomizer
37	{
38	use GetStringTrait;
39
40	private $engine;
41
42	public function __construct()
43	{
44	$this->engine = $this->makeEngine();
45	}
46
47	public function getBytes(int $length)
48	{
49	$result = '';
50
51	while (strlen($result) < $length) {
52	$result .= $this->engine->generate();
53	}
54
55	return substr($result, 0, $length);
56	}
57
58	public function getBytesFromString(string $string, int $length)
59	{
60	if ($length === 0) {
61	throw new InvalidArgumentException('Length cannot be zero.');
62	}
63
64	$sourceLength = strlen($string);
65
66	if ($sourceLength === 0) {
67	throw new InvalidArgumentException(
68	'Source string cannot be empty.'
69	);
70	}
71
72	$result = [];
73
74	for ($i = 0; $i < $length; $i++) {
75	$index = $this->getInt(0, $sourceLength - 1);
76	$result[] = $string[$index];
77	}
78
79	return implode('', $result);
80	}
81
82	public function getFloat(float $min, float $max)
83	{
84	if ($min >= $max) {
85	throw new InvalidArgumentException(
86	'The minimum value must be less than the maximum value.'
87	);
88	}
89
90	$randomFraction = $this->nextFloat();
91
92	return $min + ($randomFraction * ($max - $min));
93	}
94
95	public function getInt(int $min, int $max)
96	{
97	$range = $max - $min + 1;
98	return $min + random_int(0, $range - 1);
99	}
100
101	public function nextFloat()
102	{
103	return random_int(0, PHP_INT_MAX) / (PHP_INT_MAX + 1);
104	}
105
106	public function nextInt()
107	{
108	return random_int(0, PHP_INT_MAX);
109	}
110
111	public function pickArrayKeys(array $array, int $num)
112	{
113	if ($num > count($array)) {
114	throw new InvalidArgumentException(
115	'Cannot pick more keys than the array size.'
116	);
117	}
118
119	$pickedKeys = [];
120
121	$keys = array_keys($array);
122
123	while (count($pickedKeys) < $num) {
124	$index = random_int(0, count($keys) - 1);
125	$pickedKeys[] = $keys[$index];
126	array_splice($keys, $index, 1);
127	}
128
129	return $pickedKeys;
130	}
131
132	public function shuffleArray(array $array)
133	{
134	$count = count($array);
135
136	if ($count < 2) {
137	return $array;
138	}
139
140	$originalArray = $array;
141
142	// Shuffle and check if the result is different
143	do {
144	// Perform the Fisher-Yates shuffle
145	for ($i = $count - 1; $i > 0; $i--) {
146	$j = random_int(0, $i);
147	[$array[$i], $array[$j]] = [$array[$j], $array[$i]];
148	}
149	} while ($array === $originalArray);
150
151	return $array;
152	}
153
154	public function shuffleBytes(string $bytes)
155	{
156	$array = str_split($bytes);
157	$shuffled = $this->shuffleArray($array);
158	return implode('', $shuffled);
159	}
160
161	private function makeEngine()
162	{
163	return new class {
164	public function generate() {
165	$length = 32;
166
167	if (function_exists('random_bytes')) {
168	return random_bytes($length);
169	}
170
171	if (function_exists('openssl_random_pseudo_bytes')) {
172	return openssl_random_pseudo_bytes($length);
173	}
174
175	throw new Exception('No secure random source available.');
176	}
177	};
178	}
179	}
180	}
181