A small PHP implementation of Kirupa.coms 3D 'engine'. It does the basic math and lacks commenting.

gistfile1.php

<?PHP

  class ThreeD
	{		
		static public function Transform2Dto3D(array $points, array $axis, $focalLength, $center_x, $center_y)
		{
			$pointarray = array();
			
			$sx = sin($axis['x']);
			$cx = cos($axis['x']);
			$sy = sin($axis['y']);
			$cy = cos($axis['y']);
			$sz = sin($axis['z']);
			$cz = cos($axis['z']);
			
			$i = count($points);
			while($i--)
			{
				//For each point, build defaults
				$x = $points[$i]['x'];
				$y = $points[$i]['y'];
				$z = $points[$i]['z'];
				
				// rotation around x
				$xy = $cx*$y - $sx*$z;
				$xz = $sx*$y + $cx*$z;
				
				// rotation around y
				$yz = $cy*$xz - $sy*$x;
				$yx = $sy*$xz + $cy*$x;
				
				// rotation around z
				$zx = $cz*$yx - $sz*$xy;
				$zy = $sz*$yx + $cz*$xy;
				
				$scaleFactor = $focalLength / ($focalLength + $yz);
				$x = ($zx*$scaleFactor) + $center_x;
				$y = ($zy*$scaleFactor) + $center_y;
				$z = $yz;
				
				$pointarray[$i] = ThreeD::make3DPoint($x, $y, $z);
			}
			return $pointarray;
		}

		static public function make3DPoint($x = null, $y = null,  $z = null)
		{
			$point = array();
			$point['x'] = $x;
			$point['y'] = $y;
			$point['z'] = $z;
			return $point;
		}

		static public function getRotation($x_rotate, $y_rotate, $z_rotate)
		{
			$x_rad = ( $x_rotate / ( 180/pi() ) );
			$y_rad = ( $y_rotate / ( 180/pi() ) );
			$z_rad = ( $z_rotate / ( 180/pi() ) );
			 
			return ThreeD::make3DPoint($x_rad, $y_rad, $z_rad);
		}
	}

?>