php Search or sort multi dimensional array for closest lat and lon values

php sort array by closest lat and lng coordinates

<?php
 $arrGeoData = array(
	  array(
            "zipcode"   => 777,
            "latitude"  => 37.234982,
            "longitude" => -82.913799,
            "cityname"  => "tiflis",
        ),
	  array(
            "zipcode"   => 666,
            "latitude"  => 36.664982,
            "longitude" => -80.913799,
            "cityname"  => "gori",
        ),
	   array(
            "zipcode"   => 6366,
            "latitude"  => 49.664982,
            "longitude" => -70.913799,
            "cityname"  => "kaspi",
        ),
	   array(
            "zipcode"   => 666,
            "latitude"  => 43.664982,
            "longitude" => -76.913799,
            "cityname"  => "oni",
        ),
	 
        array(
            "zipcode"   => 2824599,
            "latitude"  => 60.234982,
            "longitude" => -72.913799,
            "cityname"  => "ACME",
        ),
	 array(
            "zipcode"   => 17198,
            "latitude"  => 51.735880,
            "longitude" => -73.143855,
            "cityname"  => "zeland",
        ),
        array(
            "zipcode"   => 17198,
            "latitude"  => 54.735880,
            "longitude" => -74.143855,
            "cityname"  => "NEWLAND",
        ),
        array(
            "zipcode"   => 12203,
            "latitude"  => 41.711931,
            "longitude" => -75.011806,
            "cityname"  => "ACE",
        ),
    );
    $nearestLongLat     = sortByNearestLatLong($arrGeoData, 40.6000, -74.15000,false);
echo '<pre>';   
var_dump($nearestLongLat);




    function sortByNearestLatLong($geoData, $lat, $long, $returnNearestOnly=true){
        // CREATE AN ARRAY FOR USE INSIDE THE FUNCTION
        $arrCloseMatchLat   = array();
        $arrCloseMatchLong  = array();
        $matchedGeoSet      = array();

        // LOOP THROUGH ALL THE $geoData ARRAY AND SUBTRACT THE GIVEN LAT & LONG VALUES
        // FROM THOSE CONTAINED IN THE ORIGINAL ARRAY: $geoData
        // WE KNOW THAT THE SMALLER THE RESULT OF THE SUBTRACTION; THE CLOSER WE ARE
        // WE DO THIS FOR BOTH THE LONGITUDE & LATITUDE... HENCE OUR ARRAY:
        // $arrCloseMatchLat AND $arrCloseMatchLong RESPECTIVELY
        foreach($geoData as $iKey=>$arrGeoStrip){
            $arrCloseMatchLat[$iKey]    =  abs(floatval( ($arrGeoStrip['latitude'])  - $lat  ));
            $arrCloseMatchLong[$iKey]   =  abs(floatval( ($arrGeoStrip['longitude']) - $long ));
        }


    // WE SORT BOTH ARRAYS NUMERICALLY KEEPING THE KEYS WHICH WE NEED FOR OUR FINAL RESULT
        asort($arrCloseMatchLat, SORT_NUMERIC);
        asort($arrCloseMatchLong, SORT_NUMERIC);

        // WE CAN RETURN ONLY THE RESULT OF THE FIRST, CLOSEST MATCH
        if($returnNearestOnly){
            foreach($arrCloseMatchLat as $index=>$difference){
                $matchedGeoSet['latitudes'][]  = $geoData[$index];
                break;
            }
            foreach($arrCloseMatchLong as $index=>$difference){
                $matchedGeoSet['longitudes'][] = $geoData[$index];
                break;
            }
            // OR WE CAN RETURN THE ENTIRE $geoData ARRAY ONLY SORTED IN A "CLOSEST FIRST" FASHION...
            // WE DO THIS FOR BOTH THE LONGITUDE & LATITUDE RESPECTIVELY SO WE END UP HAVING 2
            // ARRAYS: ONE THAT SORTS THE CLOSEST IN TERMS OF LONG VALUES
            // AN ONE THAT SORTS THE CLOSEST IN TERMS OF LAT VALUES...
        }else{
            foreach($arrCloseMatchLat as $index=>$difference){
                $matchedGeoSet['latitudes'][]  = $geoData[$index];
            }
            foreach($arrCloseMatchLong as $index=>$difference){
                $matchedGeoSet['longitudes'][] = $geoData[$index];
            }
        }
        return $matchedGeoSet;
    }