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diff --git a/src/Identifiers/Random.php b/src/Identifiers/Random.php
new file mode 100644
--- /dev/null
+++ b/src/Identifiers/Random.php
@@ -0,0 +1,119 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Identifiers;
+
+use Closure;
+use InvalidArgumentException;
+
+class Random {
+
+ /**
+ * @return string 32 random hexadecimal characters
+ */
+ public static function generateHexHash () : string {
+ return UUID::UUIDv4WithoutHyphens();
+ }
+
+ /**
+ * @param string $format A for letters, 1 for digits, e.g. AAA111
+ *
+ * @return string a random string based on the format e.g. ZCK530
+ */
+ public static function generateString (string $format) : string {
+ $randomString = "";
+
+ $len = strlen($format);
+ for ($i = 0 ; $i < $len ; $i++) {
+ $randomString .= self::generateCharacter($format[$i]);
+ }
+
+ return $randomString;
+ }
+
+ /**
+ * @param string $format A for letters, 1 for digits, e.g. A
+ *
+ * @return string a random string based on the format e.g. Z
+ */
+ public static function generateCharacter (string $format) : string {
+ return self::getPicker(self::normalizeFormat($format))();
+ }
+
+ ///
+ /// Helper methods for pickers
+ ///
+
+ public static function normalizeFormat (string $format) : string {
+ $normalizers = self::getNormalizers();
+
+ foreach ($normalizers as $normalizedFormat => $conditionClosure) {
+ if ($conditionClosure($format)) {
+ return (string)$normalizedFormat;
+ }
+ }
+
+ return $format;
+ }
+
+ private static function getNormalizers () : array {
+ /**
+ * <normalized format> => <method which returns true if format matches>
+ */
+
+ return [
+
+ 'A' => function ($format) : bool {
+ return ctype_upper($format);
+ },
+
+ 'a' => function ($format) : bool {
+ return ctype_lower($format);
+ },
+
+ '1' => function ($format) : bool {
+ return is_numeric($format);
+ },
+
+ ];
+ }
+
+ private static function getPickers () : array {
+ return [
+
+ 'A' => function () : string {
+ return Random::pickLetter();
+ },
+
+ 'a' => function () : string {
+ return strtolower(Random::pickLetter());
+ },
+
+ '1' => function () : string {
+ return (string)Random::pickDigit();
+ },
+
+ ];
+ }
+
+ public static function pickLetter () : string {
+ $asciiCode = 65 + mt_rand() % 26;
+
+ return chr($asciiCode);
+ }
+
+ public static function pickDigit (int $base = 10) : int {
+ return mt_rand() % $base;
+ }
+
+ private static function getPicker (string $format) : Closure {
+ $pickers = self::getPickers();
+
+ if (isset($pickers[$format])) {
+ return $pickers[$format];
+ }
+
+ throw new InvalidArgumentException();
+ }
+
+}
diff --git a/src/Identifiers/UUID.php b/src/Identifiers/UUID.php
--- a/src/Identifiers/UUID.php
+++ b/src/Identifiers/UUID.php
@@ -36,4 +36,8 @@
);
}
+ public static function UUIDv4WithoutHyphens () : string {
+ return str_replace("-", "", self::UUIDv4());
+ }
+
}
diff --git a/tests/Identifiers/RandomTest.php b/tests/Identifiers/RandomTest.php
new file mode 100644
--- /dev/null
+++ b/tests/Identifiers/RandomTest.php
@@ -0,0 +1,46 @@
+<?php
+declare(strict_types=1);
+
+namespace Keruald\OmniTools\Tests\Identifiers;
+
+use Keruald\OmniTools\Identifiers\Random;
+use Phpunit\Framework\TestCase;
+
+class RandomTest extends TestCase {
+
+ public function testGenerateHexadecimalHash () : void {
+ $hash = Random::generateHexHash();
+
+ $this->assertEquals(
+ 32, strlen($hash),
+ "$hash size must be 32 characters"
+ );
+
+ $this->assertRegExp("/[0-9a-f]{32}/", $hash);
+ }
+
+ public function testHexadecimalHashesAreUnique() : void {
+ $this->assertNotEquals(
+ Random::generateHexHash(),
+ Random::generateHexHash()
+ );
+ }
+
+ /**
+ * @dataProvider provideRandomStringFormats
+ */
+ public function testRandomString($format, $re, $len) : void {
+ $string = Random::generateString($format);
+
+ $this->assertEquals($len, strlen($format));
+ $this->assertRegExp($re, $string);
+ }
+
+ public function provideRandomStringFormats() : iterable {
+ yield ["AAA111", "/^[A-Z]{3}[0-9]{3}$/", 6];
+ yield ["AAA123", "/^[A-Z]{3}[0-9]{3}$/", 6];
+ yield ["ABC123", "/^[A-Z]{3}[0-9]{3}$/", 6];
+ yield ["", "/^$/", 0];
+ }
+
+}
diff --git a/tests/Identifiers/UUIDTest.php b/tests/Identifiers/UUIDTest.php
--- a/tests/Identifiers/UUIDTest.php
+++ b/tests/Identifiers/UUIDTest.php
@@ -20,6 +20,18 @@
$this->assertRegExp($re, $uuid);
}
+ public function testUUIDv4WithoutHyphens () : void {
+ $uuid = UUID::UUIDv4WithoutHyphens();
+
+ $this->assertEquals(
+ 32, strlen($uuid),
+ "UUID size must be 36 characters, and there are 4 hyphens, so here 32 characters are expected."
+ );
+
+ $re = "/[0-9a-f]/";
+ $this->assertRegExp($re, $uuid);
+ }
+
public function testUUIDv4AreUnique () : void {
$this->assertNotEquals(UUID::UUIDv4(), UUID::UUIDv4());
}

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