added rgbCssColor method

readme.md

@@ -191,6 +191,7 @@ Each of the generator properties (like `name`, `address`, and `lorem`) are calle
     hexcolor               // '#fa3cc2'
     rgbcolor               // '0,255,122'
     rgbColorAsArray        // array(0,255,122)
+    rgbCssColor            // 'rgb(0,255,122)'
     safeColorName          // 'fuchsia'
     colorName              // 'Gainsbor'
 

src/Faker/Provider/Color.php

@@ -105,6 +105,14 @@ class Color extends Base
 		return implode(',', static::rgbColorAsArray());
 	}
 
+	/**
+	 * @example 'rgb(0,255,122)'
+	 */
+	public static function rgbCssColor()
+	{
+		return 'rgb(' . static::rgbColor() . ')';
+	}
+
 	/**
 	 * @example 'blue'
 	 */

test/Faker/Provider/ColorTest.php

@@ -23,4 +23,10 @@ class ColorTest extends \PHPUnit_Framework_TestCase
 		$this->assertRegExp('/^' . $regexp . ',' . $regexp . ',' . $regexp . '$/i', Color::rgbColor());
 	}
 
+	public function testRgbCssColor()
+	{
+		$regexp = '([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])';
+		$this->assertRegExp('/^rgb\(' . $regexp . ',' . $regexp . ',' . $regexp . '\)$/i', Color::rgbCssColor());
+	}
+
 }