foreach proper use of key values?

[sonny]

Hi, I'm creating a location map, this works for multi values from db.

PHP Code:

while($row = mysql_fetch_array( $result )) {
    $lat=$row['lat'];
    $lon=$row['lon'];
$pt = getlocationcoords($lat, $lon, $scale_x, $scale_y);
imagefilledrectangle($im,$pt["x"]-2,$pt["y"]-2,$pt["x"]+2,$pt["y"]+2,$dotcolor);
} 


problem is I need to do this with 2 pairs of lat and lon with a foreach
not sure of the format how to do this or how to use the key/s properly

PHP Code:

$cord;
$cord["lat1"] = $lat1;
$cord["lon1"] = $lon1
$cord["dotcolor1"] = $dotcolor1;

$cord["lat2"] = $lat2;
$cord["lon2"] = $lon2
$cord["dotcolor2"] = $dotcolor2;

foreach( $cord as $key => $value){
//$pt = getlocationcoords($lat, $lon, $scale_x, $scale_y);
//imagefilledrectangle($im,$pt["x"]-2,$pt["y"]-2,$pt["x"]+2,$pt["y"]+2,$dotcolor);
} 


Thanks
Sonny

[Fou-Lu]

How did you get $lat1/$lon1 and $lat2/$lon2 to start with?
In order to get what you want in pairs, you need to specify them as an array within the single offset of $cord.

PHP Code:

$cord = array(
    array(
        'lat' => array($lat1, $lat2),
        'lon' => array($lon1, $lon2),
        'dotcolor' => array($dotcolor1, $dotcolor2)
    )
);

foreach ($cord AS $itm)
{
    list($firstLat, $secondLat) = $itm['lat'];
    list($firstLon, $secondLon) = $itm['lon'];
    list($firstDotColour, $secondDotColour) = $itm['dotcolor'];
    printf('$firstLat: %s, $secondLat: %s, $firstLon: %s, $secondLon: %s, $firstDotColour: %s, $secondDotColour: %s',
        $firstLat, $secondLat, $firstLon, $secondLon, $firstDotColour, $secondDotColour);
} 


That's for if you want to inter-relate multiple things together.
For individuals at a time, you can use like so:

PHP Code:

$cord[0]['lat'] = $lat1;
$cord[0]['lon'] = $lon1;
$cord[0]['dotcolor'] = $dotcolor1;
$cord[1]['lat'] = $lat2;
$cord[1]['lon'] = $lon2;
$cord[1]['dotcolor'] = $dotcolor2; 


Or just traditional array building with key=>value pairs. Iteration would then have $value as an array with lat, lon, and dotcolor as valid associative indexes.

[sonny]

Hi, Fou

Wound up trying two arrays with a combine "just a 3 line foreach", which did work, but then
realized I needed a separate dot color as well so I finally just did this.

PHP Code:

$pt2 = getlocationcoords($lat2, $lon2, $scale_x, $scale_y);
imagefilledrectangle($im,$pt2["x"]-2,$pt2["y"]-2,$pt2["x"]+2,$pt2["y"]+2,$dotcolor2); 


and all was fine

Sonny