从Google Map Link提取经度和纬度

Question

Supposing I had the following link to a google map: https://www.google.com.gh/maps/place/Niagara+Falls/@43.0828162,-79.0763516,17z/data=!4m15!1m9!4m8!1m0!1m6!1m2!1s0x89d34307412d7ae9:0x29be1d1e689ce35b!2sNiagara+Falls,+NY+14303,+United+States!2m2!1d-79.0741629!2d43.0828162!3m4!1s0x89d34307412d7ae9:0x29be1d1e689ce35b!8m2!3d43.0828162!4d-79.0741629

I would like to extract only the latitude and longitude from the following link. I assume I would need to use regular expression to do this but I have no idea how to go about it.

The co-ordinates in this case would be 43.0828162,-79.0763516

Answer 1

I would use a simple RegX like this

preg_match('/@(\-?[0-9]+\.[0-9]+),(\-?[0-9]+\.[0-9]+)/', $url, $match );

You can see it here, using your url.

https://regex101.com/r/hD7lV0/1

just for sake of explaining it

• Match @ Literal At sign one time
• Match - , literal hyphen/minus ? one or none times
• Match [0-9] , + one or more times
• Match \\. literal . decimal one time
• Match [0-9] , + one or more times
• Match , , literal , comma one time etc...

Answer 2

I would do.

<?php
    $latLong = split(',',preg_match('/@([0-9\.-,]*?)\//',$url));
    // $latLon = [lat, long] = $latLon[0],$latLom[1]
?>

• Match @ Symbol (as start of match)
• Any Number, Fullstop, minus or comma up-until the next '/' (escaped with '\\')
• Split it into two parts on the ','

If needs be you can test it with

if (count($latLon) > 2){
    die('Invalid URL Segment found.');
}

If you want to be really short with your regex

    $latLong = split(',',preg_match('/@(.*?)\//',$url));