Something

$delta = 0.9-1;//$delta = -0.1; //Works ok for this valueecho $delta.'<br />'; //Echo -0.1								if(abs($delta)>=0.1)				{					if($delta<0)						$tendance = -1;					else						$tendance = 1;				}				else					$tendance = 0;echo $tendance; //Echo 0 ; expected value = -1