Function to convert Geo coordinates To Pixels

convertGeoToPixel.php

<?php 

  function convertGeoToPixel($lat, $lon){

	$mapWidth = 400;
	$mapHeight = 260;
	
	$mapLonLeft = -180;
	$mapLonRight = 180;
	$mapLonDelta = $mapLonRight - $mapLonLeft;
	
	//http://stackoverflow.com/questions/2103924/mercator-longitude-and-latitude-calculations-to-x-and-y-on-a-cropped-map-of-the/10401734#10401734
	//-169.4531,-44.8403,177.8906,77.9157
	//-180,-56.1700,180,83.6769
	
	$mapLatBottom = -56.1700;
	$mapLatBottomDegree = $mapLatBottom * M_PI / 180;
	
	  //  global $mapWidth, $mapHeight, $mapLonLeft, $mapLonDelta, $mapLatBottom, $mapLatBottomDegree;
	
	    $x = ($lon - $mapLonLeft) * ($mapWidth / $mapLonDelta);
	
	    $lat = $lat * M_PI / 180;
	    $worldMapWidth = (($mapWidth / $mapLonDelta) * 360) / (2 * M_PI);
	    $mapOffsetY = ($worldMapWidth / 2 * log((1 + sin($mapLatBottomDegree)) / (1 - sin($mapLatBottomDegree))));
	    $y = $mapHeight - (($worldMapWidth / 2 * log((1 + sin($lat)) / (1 - sin($lat)))) - $mapOffsetY);
	
	    return array($x, $y);
	}

?>

Do you have reverse function of this ?(Etc: pixel to geo coordinates)

I m also insterested in reverse function of this as well.

No sorry I didn't need it at this time
If someone can work on it I'd be happy to include it