symfony
diff --git a/‎src/Symfony/Component/Console/CHANGELOG.md
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diff --git a/‎src/Symfony/Component/Console/Color.php
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diff --git a/‎src/Symfony/Component/Console/Tests/ColorTest.php
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@@ -6,6 +6,7 @@ CHANGELOG
 
  * Add `TesterTrait::assertCommandIsSuccessful()` to test command
  * Deprecate `HelperSet::setCommand()` and `getCommand()` without replacement
+ * Add `rgb(r, g, b)` notation support for output colors
 
 5.3
 ---
 
@@ -49,6 +49,8 @@ final class Color
         'conceal' => ['set' => 8, 'unset' => 28],
     ];
 
+    private const RGB_FUNCTIONAL_NOTATION_REGEX = '/^rgb\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/';
+
     private $foreground;
     private $background;
     private $options = [];
@@ -116,6 +118,10 @@ private function parseColor(string $color, bool $background = false): string
             return '';
         }
 
+        if (str_starts_with($color, 'rgb(')) {
+            $color = $this->rgbToHex($color);
+        }
+
         if ('#' === $color[0]) {
             $color = substr($color, 1);
 
@@ -177,4 +183,23 @@ private function getSaturation(int $r, int $g, int $b): int
 
         return (int) $diff * 100 / $v;
     }
+
+    private function rgbToHex(string $color): string
+    {
+        if (!preg_match(self::RGB_FUNCTIONAL_NOTATION_REGEX, $color, $matches)) {
+            throw new InvalidArgumentException(sprintf('Invalid RGB functional notation; should be of the form "rgb(r, g, b)", got "%s".', $color));
+        }
+
+        $rgb = \array_slice($matches, 1);
+
+        $hexString = array_map(function ($element) {
+            if ($element > 255) {
+                throw new InvalidArgumentException(sprintf('Invalid color component; value should be between 0 and 255, got %d.', $element));
+            }
+
+            return str_pad(dechex((int) $element), 2, '0', \STR_PAD_LEFT);
+        }, $rgb);
+
+        return '#'.implode('', $hexString);
+    }
 }
@@ -13,6 +13,7 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Console\Color;
+use Symfony\Component\Console\Exception\InvalidArgumentException;
 
 class ColorTest extends TestCase
 {
@@ -42,6 +43,9 @@ public function testTrueColors()
 
         $color = new Color('#ffffff', '#000000');
         $this->assertSame("\033[38;2;255;255;255;48;2;0;0;0m \033[39;49m", $color->apply(' '));
+
+        $color = new Color('rgb(255, 255, 255)', 'rgb(0, 0, 0)');
+        $this->assertSame("\033[38;2;255;255;255;48;2;0;0;0m \033[39;49m", $color->apply(' '));
     }
 
     public function testDegradedTrueColors()
@@ -59,4 +63,32 @@ public function testDegradedTrueColors()
             putenv('COLORTERM='.$colorterm);
         }
     }
+
+    /**
+     * @dataProvider provideMalformedRgbStrings
+     */
+    public function testMalformedRgbString(string $color, string $exceptionMessage)
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage($exceptionMessage);
+
+        new Color($color);
+    }
+
+    public function provideMalformedRgbStrings(): \Generator
+    {
+        yield ['rgb()', 'Invalid RGB functional notation; should be of the form "rgb(r, g, b)", got "rgb()".'];
+
+        yield ['rgb(0, 0)', 'Invalid RGB functional notation; should be of the form "rgb(r, g, b)", got "rgb(0, 0)".'];
+
+        yield ['rgb(0, 0, 0, 0)', 'Invalid RGB functional notation; should be of the form "rgb(r, g, b)", got "rgb(0, 0, 0, 0)".'];
+
+        yield ['rgb(-1, 0, 0)', 'Invalid RGB functional notation; should be of the form "rgb(r, g, b)", got "rgb(-1, 0, 0)".'];
+
+        yield ['rgb(invalid, 0, 0)', 'Invalid RGB functional notation; should be of the form "rgb(r, g, b)", got "rgb(invalid, 0, 0)".'];
+
+        yield ['rgb(256, 0, 0)', 'Invalid color component; value should be between 0 and 255, got 256.'];
+
+        yield ['rgb(0, 0, 0', 'Invalid RGB functional notation; should be of the form "rgb(r, g, b)", got "rgb(0, 0, 0".'];
+    }
 }