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Edit File: Dimension.php

<?php

/**
 * Dimension
 *
 * @package Less
 * @subpackage tree
 */
class Less_Tree_Dimension extends Less_Tree{

public $value;
	public $unit;
	public $type = 'Dimension';

public function __construct($value, $unit = null){
        $this->value = floatval($value);

if( $unit && ($unit instanceof Less_Tree_Unit) ){
			$this->unit = $unit;
		}elseif( $unit ){
			$this->unit = new Less_Tree_Unit( array($unit) );
		}else{
			$this->unit = new Less_Tree_Unit( );
		}
    }

public function accept( $visitor ){
		$this->unit = $visitor->visitObj( $this->unit );
	}

public function compile(){
        return $this;
    }

public function toColor() {
        return new Less_Tree_Color(array($this->value, $this->value, $this->value));
    }

/**
     * @see Less_Tree::genCSS
     */
	public function genCSS( $output ){

if( Less_Parser::$options['strictUnits'] && !$this->unit->isSingular() ){
			throw new Less_Exception_Compiler("Multiple units in dimension. Correct the units or use the unit function. Bad unit: ".$this->unit->toString());
		}

$value = Less_Functions::fround( $this->value );
		$strValue = (string)$value;

if( $value !== 0 && $value < 0.000001 && $value > -0.000001 ){
			// would be output 1e-6 etc.
			$strValue = number_format($strValue,10);
			$strValue = preg_replace('/\.?0+$/','', $strValue);
		}

if( Less_Parser::$options['compress'] ){
			// Zero values doesn't need a unit
			if( $value === 0 && $this->unit->isLength() ){
				$output->add( $strValue );
				return $strValue;
			}

// Float values doesn't need a leading zero
			if( $value > 0 && $value < 1 && $strValue[0] === '0' ){
				$strValue = substr($strValue,1);
			}
		}

$output->add( $strValue );
		$this->unit->genCSS( $output );
	}

public function __toString(){
        return $this->toCSS();
    }

// In an operation between two Dimensions,
    // we default to the first Dimension's unit,
    // so `1px + 2em` will yield `3px`.

/**
     * @param string $op
     */
    public function operate( $op, $other){

$value = Less_Functions::operate( $op, $this->value, $other->value);
		$unit = clone $this->unit;

if( $op === '+' || $op === '-' ){

if( !$unit->numerator && !$unit->denominator ){
				$unit->numerator = $other->unit->numerator;
				$unit->denominator = $other->unit->denominator;
			}elseif( !$other->unit->numerator && !$other->unit->denominator ){
				// do nothing
			}else{
				$other = $other->convertTo( $this->unit->usedUnits());

if( Less_Parser::$options['strictUnits'] && $other->unit->toString() !== $unit->toCSS() ){
					throw new Less_Exception_Compiler("Incompatible units. Change the units or use the unit function. Bad units: '" . $unit->toString() . "' and " . $other->unit->toString() . "'.");
				}

$value = Less_Functions::operate( $op, $this->value, $other->value);
			}
		}elseif( $op === '*' ){
			$unit->numerator = array_merge($unit->numerator, $other->unit->numerator);
			$unit->denominator = array_merge($unit->denominator, $other->unit->denominator);
			sort($unit->numerator);
			sort($unit->denominator);
			$unit->cancel();
		}elseif( $op === '/' ){
			$unit->numerator = array_merge($unit->numerator, $other->unit->denominator);
			$unit->denominator = array_merge($unit->denominator, $other->unit->numerator);
			sort($unit->numerator);
			sort($unit->denominator);
			$unit->cancel();
		}
		return new Less_Tree_Dimension( $value, $unit);
    }

public function compare($other) {
		if ($other instanceof Less_Tree_Dimension) {

if( $this->unit->isEmpty() || $other->unit->isEmpty() ){
				$a = $this;
				$b = $other;
			} else {
				$a = $this->unify();
				$b = $other->unify();
				if( $a->unit->compare($b->unit) !== 0 ){
					return -1;
				}
			}
			$aValue = $a->value;
			$bValue = $b->value;

if ($bValue > $aValue) {
				return -1;
			} elseif ($bValue < $aValue) {
				return 1;
			} else {
				return 0;
			}
		} else {
			return -1;
		}
	}

public function unify() {
		return $this->convertTo(array('length'=> 'px', 'duration'=> 's', 'angle' => 'rad' ));
	}

public function convertTo($conversions) {
		$value = $this->value;
		$unit = clone $this->unit;

if( is_string($conversions) ){
			$derivedConversions = array();
			foreach( Less_Tree_UnitConversions::$groups as $i ){
				if( isset(Less_Tree_UnitConversions::${$i}[$conversions]) ){
					$derivedConversions = array( $i => $conversions);
				}
			}
			$conversions = $derivedConversions;
		}

foreach($conversions as $groupName => $targetUnit){
			$group = Less_Tree_UnitConversions::${$groupName};

//numerator
			foreach($unit->numerator as $i => $atomicUnit){
				$atomicUnit = $unit->numerator[$i];
				if( !isset($group[$atomicUnit]) ){
					continue;
				}

$value = $value * ($group[$atomicUnit] / $group[$targetUnit]);

$unit->numerator[$i] = $targetUnit;
			}

//denominator
			foreach($unit->denominator as $i => $atomicUnit){
				$atomicUnit = $unit->denominator[$i];
				if( !isset($group[$atomicUnit]) ){
					continue;
				}

$value = $value / ($group[$atomicUnit] / $group[$targetUnit]);

$unit->denominator[$i] = $targetUnit;
			}
		}

$unit->cancel();

return new Less_Tree_Dimension( $value, $unit);
    }
}

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