original_string: public static function changeBrightness($hex, $adjustPercentage)
      {
          $rgba = (strlen($hex) == 8);
  
          $red = self::getRed($hex, false);
          $green = self::getGreen($hex, false);
          $blue = self::getBlue($hex, false);
          if ($adjustPercentage > 0) {
              $red += (255 - $red) * $adjustPercentage;
              $green += (255 - $green) * $adjustPercentage;
              $blue += (255 - $blue) * $adjustPercentage;
          } else {
              $red += $red * $adjustPercentage;
              $green += $green * $adjustPercentage;
              $blue += $blue * $adjustPercentage;
          }
  
          if ($red < 0) {
              $red = 0;
          } elseif ($red > 255) {
              $red = 255;
          }
          if ($green < 0) {
              $green = 0;
          } elseif ($green > 255) {
              $green = 255;
          }
          if ($blue < 0) {
              $blue = 0;
          } elseif ($blue > 255) {
              $blue = 255;
          }
  
          $rgb = strtoupper(
              str_pad(dechex($red), 2, '0', 0) .
              str_pad(dechex($green), 2, '0', 0) .
              str_pad(dechex($blue), 2, '0', 0)
          );
          return (($rgba) ? 'FF' : '') . $rgb;
      }
code: public static function changeBrightness($hex, $adjustPercentage)
      {
          $rgba = (strlen($hex) == 8);
  
          $red = self::getRed($hex, false);
          $green = self::getGreen($hex, false);
          $blue = self::getBlue($hex, false);
          if ($adjustPercentage > 0) {
              $red += (255 - $red) * $adjustPercentage;
              $green += (255 - $green) * $adjustPercentage;
              $blue += (255 - $blue) * $adjustPercentage;
          } else {
              $red += $red * $adjustPercentage;
              $green += $green * $adjustPercentage;
              $blue += $blue * $adjustPercentage;
          }
  
          if ($red < 0) {
              $red = 0;
          } elseif ($red > 255) {
              $red = 255;
          }
          if ($green < 0) {
              $green = 0;
          } elseif ($green > 255) {
              $green = 255;
          }
          if ($blue < 0) {
              $blue = 0;
          } elseif ($blue > 255) {
              $blue = 255;
          }
  
          $rgb = strtoupper(
              str_pad(dechex($red), 2, '0', 0) .
              str_pad(dechex($green), 2, '0', 0) .
              str_pad(dechex($blue), 2, '0', 0)
          );
          return (($rgba) ? 'FF' : '') . $rgb;
      }
code_tokens: public static function changeBrightness ( $ hex , $ adjustPercentage ) { $ rgba = ( strlen ( $ hex ) == 8 ) ; $ red = self :: getRed ( $ hex , false ) ; $ green = self :: getGreen ( $ hex , false ) ; $ blue = self :: getBlue ( $ hex , false ) ; if ( $ adjustPercentage > 0 ) { $ red += ( 255 - $ red ) * $ adjustPercentage ; $ green += ( 255 - $ green ) * $ adjustPercentage ; $ blue += ( 255 - $ blue ) * $ adjustPercentage ; } else { $ red += $ red * $ adjustPercentage ; $ green += $ green * $ adjustPercentage ; $ blue += $ blue * $ adjustPercentage ; } if ( $ red < 0 ) { $ red = 0 ; } elseif ( $ red > 255 ) { $ red = 255 ; } if ( $ green < 0 ) { $ green = 0 ; } elseif ( $ green > 255 ) { $ green = 255 ; } if ( $ blue < 0 ) { $ blue = 0 ; } elseif ( $ blue > 255 ) { $ blue = 255 ; } $ rgb = strtoupper ( str_pad ( dechex ( $ red ) , 2 , '0' , 0 ) . str_pad ( dechex ( $ green ) , 2 , '0' , 0 ) . str_pad ( dechex ( $ blue ) , 2 , '0' , 0 ) ) ; return ( ( $ rgba ) ? 'FF' : '' ) . $ rgb ; }
docstring: Adjust the brightness of a color
  
  @param    string        $hex    The colour as an RGBA or RGB value (e.g. FF00CCCC or CCDDEE)
  @param    float        $adjustPercentage    The percentage by which to adjust the colour as a float from -1 to 1
  @return    string        The adjusted colour as an RGBA or RGB value (e.g. FF00CCCC or CCDDEE)
docstring_tokens: Adjust the brightness of a color