OMGM Code

<?php

function Google_Tile_Factors($zoom, $tileSize = 256){

 if ( !isset($zoom) || $zoom < 0 ) {
     $zoom = 0;
 }

 $value = array();
 
 $value['zoom']	= $zoom ;
 $value['PI']	= pi(); //3.1415926536 ;
 $value['bc']	= 2 * $value['PI'] ;
 $value['Wa']	= $value['PI'] / 180 ;
 $value['cp']	= pow(2, ($value['zoom'] + 8) );
 $value['max']	= pow(2, $value['zoom']) - 1 ;		# Maximum Tile Number
 $value['pixLngDeg']= $value['cp'] / 360;
 $value['pixLngRad']= $value['cp'] / $value['bc'] ;
 $value['bmO']	= $value['cp'] / 2 ;
 $value['tileSize'] = $tileSize ;

 return $value ;
}

function Google_Tile_Calc($value, $ty, $tx){

  $result = array();
  
  $result["NAMEX"] = $tx;
  $result["NAMEY"] = $ty;
  
  list( $result["PYN"], $result['PXW']) = Google_Tile_to_Pix( $value, $ty, $tx ) ;

 // Convert Pixels to Coordinates (Upper Left Corner)...

 list($result["LATN"],$result["LNGW"]) = PixtoCoordinate( $value, $result["PYN"], $result["PXW"] ) ;

 $result["PYS"] = $result["PYN"] + 255 ;
 $result["PXE"] = $result["PXW"] + 255 ;

 // Convert Pixels to Coordinates (Lower Right Corner)...

 list($result["LATS"],$result["LNGE"]) = PixtoCoordinate( $value, $result["PYS"], $result["PXE"] ) ;
  
 return $result;
}

function Google_Tile_to_Pix($value, $y, $x){
  return array( sprintf("%0.0f", $y * $value["tileSize"]), sprintf("%0.0f", $x * $value["tileSize"]) ) ; 
}

function PixtoCoordinate($value, $y ,$x){
 $e = (($y - $value["bmO"]) / $value["pixLngRad"]) * (-1) ;

 $d = array();
 
 $d[1]	= sprintf("%0.6f",($x - $value["bmO"]) / $value["pixLngDeg"]) ;
 $d[0]	= sprintf("%0.6f", (2 * atan(exp($e)) - $value["PI"] / 2) / $value["Wa"]) ;
 
 return $d; 
}

function Google_RelPix($lat, $lng, $zoom){
    $PI	= pi(); //3.1415926536 ;
    $bc	= 2 * $PI;
    $Wa	= $PI / 180;
    $cp = pow(2, ($zoom + 8) );
    $pixLngDeg = $cp / 360;
    $pixLngRad = $cp / $bc ;
    $bmO = $cp / 2 ;
    
    $d = array(2);
    
    $d[1] = sprintf("%0.0f", $bmO + $lng * $pixLngDeg ) ;
    
    $e = sin($lat * $Wa) ;

    if( $e > 0.99999 ){
        $e = 0.99999 ;
    }

    if( $e < -0.99999 ){
        $e = -0.99999 ;
    }

    $d[0] = sprintf("%0.0f", $bmO + 0.5 * log((1 + $e) / (1 - $e)) * (-1) * $pixLngRad ) ;

    // 0:x 1:y
    return $d;
}

function PixtoTileName($value, $y, $x, $yd, $xd, $parwho){
  $yn = floor($y / $value["tileSize"]);
  $xn = floor($x / $value["tileSize"]);

  if( strcmp( $parwho, "Partial") != 0 ){
    if( strcmp( $yd, "N") == 0 ){
      $yn++;
    }
    else{
      $yn--;
    }

    if( strcmp( $xd, "W" ) == 0 ){
      $xn++;
    }
    else{
      $xn--;
    }
  }

  if( $yn > $value["max"] ){
    $yn = $value["max"];
  }
  elseif( $yn < 0 ){
    $yn = 0;
  }

  if( $xn > $value["max"] ){
    $xn = $value["max"];
  }
  elseif( $xn < 0 ){
    $xn = 0;
  }

  return array($yn, $xn);
}

/*
# Call as: <array of Hashes> = Google_Tiles(<LatitudeS>, <LongitudeW>, <LatitudeN>, <LongitudeE>, <Zoom>, [<option: tileSize>], [<option: 
Partial/Whole>]) ;
# Partial/Whole option: (Default: Partial)
#	Partial: Include the edge to create partial tiles
#       Whole: Include only tiles that are contained by the bounds
#
#          Returned Array Specifications:
#            Each element is a reference to a Hash:
#              NAMEY - Tile Name y
#              NAMEX - Tile Name x
#              PYS - Pixel South
#              PXW - Pixel West
#              PYN - Pixel North
#              PXE - Pixel East
#              LATS - South Latitude
#              LNGW - West Longitude
#              LATN - North Latitude
#              LNGE - East Longitude
#
#          Note: X is width, Y is height...
*/
function Google_Tiles($latS, $lngW, $latN, $lngE, $zoom, $tileSize = 256, $parwho = "Partial"){
  $value = Google_Tile_Factors($zoom, $tileSize);

  $ret = array();
  $first = array();
  $last = array();

  list( $first["NORTH"], $first["WEST"] ) = Google_RelPix($latN, $lngW, $zoom);
  list( $first["NAMEY"], $first["NAMEX"] ) = PixtoTileName( $value, $first["NORTH"], $first["WEST"], 'N', 'W', $parwho );

  list( $last["SOUTH"], $last["EAST"] ) = Google_RelPix($latS, $lngE, $zoom ) ;
  list( $last["NAMEY"], $last["NAMEX"] ) = PixtoTileName( $value, $last["SOUTH"], $last["EAST"], 'S', 'E', $parwho ) ;

  for ( $ty = $first["NAMEY"] ; $ty <= $last["NAMEY"] ; $ty++ ){
    for ( $tx = $first["NAMEX"] ; $tx <= $last["NAMEX"] ; $tx++ ){
      $ret[] = Google_Tile_Calc( $value, $ty, $tx );
    }
  }

  $ret[0]["NORTH"] = $first["NORTH"] ;
  $ret[0]["WEST"] = $first["WEST"] ;

  $ret[ count($ret) - 1 ]["SOUTH"] = $last["SOUTH"] ;
  $ret[ count($ret) - 1 ]["EAST"] = $last["EAST"] ;
 
  return $ret;
}
?>