[PHP 8.4] Add bcdivmod

Author: alexandre-daubois

README.md

@@ -73,6 +73,7 @@ Polyfills are provided for:
 - the `mb_trim`, `mb_ltrim` and `mb_rtrim` functions introduced in PHP 8.4;
 - the `CURL_HTTP_VERSION_3` and `CURL_HTTP_VERSION_3ONLY` constants introduced in PHP 8.4;
 - the `grapheme_str_split` function introduced in PHP 8.4;
+- the `bcdivmod` function introduced in PHP 8.4;
 - the `get_error_handler` and `get_exception_handler` functions introduced in PHP 8.5;
 - the `NoDiscard` attribute introduced in PHP 8.5;
 - the `array_first` and `array_last` functions introduced in PHP 8.5;

src/Php84/Php84.php

@@ -204,4 +204,14 @@ public static function grapheme_str_split(string $string, int $length)
 
         return $chunks;
     }
+
+    public static function bcdivmod(string $num1, string $num2, ?int $scale = null): ?array
+    {
+        if (null === $quot = \bcdiv($num1, $num2, 0)) {
+            return null;
+        }
+        $scale = $scale ?? (\PHP_VERSION_ID >= 70300 ? \bcscale() : (ini_get('bcmath.scale') ?: 0);
+
+        return [$quot, \bcmod($num1, $num2, $scale)];
+    }
 }

src/Php84/README.md

@@ -4,6 +4,7 @@ Symfony Polyfill / Php84
 This component provides features added to PHP 8.4 core:
 
 - [`array_find`, `array_find_key`, `array_any` and `array_all`](https://wiki.php.net/rfc/array_find)
+- [`bcdivmod`](https://wiki.php.net/rfc/add_bcdivmod_to_bcmath)
 - [`Deprecated`](https://wiki.php.net/rfc/deprecated_attribute)
 - `CURL_HTTP_VERSION_3` and `CURL_HTTP_VERSION_3ONLY` constants
 - [`fpow`](https://wiki.php.net/rfc/raising_zero_to_power_of_negative_number)

src/Php84/bootstrap.php

@@ -67,6 +67,12 @@ function mb_rtrim(string $string, ?string $characters = null, ?string $encoding
     }
 }
 
+if (extension_loaded('bcmath')) {
+    if (!function_exists('bcdivmod')) {
+        function bcdivmod(string $num1, string $num2, ?int $scale = null): ?array { return p\Php84::bcdivmod($num1, $num2, $scale); }
+    }
+}
+
 if (\PHP_VERSION_ID >= 80200) {
     return require __DIR__.'/bootstrap82.php';
 }

tests/Php84/Php84Test.php

@@ -693,4 +693,71 @@ public static function graphemeStrSplitDataProvider(): array
 
         return $cases;
     }
+
+    /**
+     * @requires extension bcmath
+     *
+     * @covers \Symfony\Polyfill\Php84\Php84::bcdivmod
+     *
+     * @dataProvider bcDivModProvider
+     */
+    public function testBcDivMod(string $num1, string $num2, ?int $scale, array $expected)
+    {
+        $this->assertSame($expected, bcdivmod($num1, $num2, $scale));
+    }
+
+    /**
+     * @requires extension bcmath
+     */
+    public function testBcDivModDivideByZero()
+    {
+        $this->expectException(\DivisionByZeroError::class);
+
+        bcdivmod('1', '0');
+    }
+
+    /**
+     * @requires extension bcmath
+     */
+    public function testBcDivModDivideByFloatingZero()
+    {
+        $this->expectException(\DivisionByZeroError::class);
+
+        bcdivmod('1', '0.00');
+    }
+
+    /**
+     * @requires PHP 8.0
+     * @requires extension bcmath
+     */
+    public function testBcDivModMalformedNumber()
+    {
+        $this->expectException(\ValueError::class);
+        $this->expectExceptionMessage('Argument #1 ($num1) is not well-formed');
+
+        bcdivmod('a', '1');
+    }
+
+    /**
+     * @requires PHP 8.0
+     * @requires extension bcmath
+     */
+    public function testBcDivModMalformedNumber2()
+    {
+        $this->expectException(\ValueError::class);
+        $this->expectExceptionMessage('Argument #2 ($num2) is not well-formed');
+
+        bcdivmod('1', 'a');
+    }
+
+    public static function bcDivModProvider(): iterable
+    {
+        yield ['1', '1', null, ['1', '0']];
+        yield ['1', '2', null, ['0', '1']];
+        yield ['5', '2', null, ['2', '1']];
+        yield ['5', '2', 0, ['2', '1']];
+        yield ['5', '2', 1, ['2', '1.0']];
+        yield ['5', '2', 2, ['2', '1.00']];
+        yield ['7.2', '3', 2, ['2', '1.20']];
+    }
 }