Calculate distance using the latitude and longitude of start and end addresses.<\/li>\n<\/ul>\n<?php
<\/span>\/\/ Google Maps API Key
<\/span>$GOOGLE_API_KEY <\/span>= <\/span>'YOUR_API_KEY_HERE'<\/span>;
<\/span>\/\/ Addresses between which distances will be calculated
<\/span>$addressFrom <\/span>= <\/span>'616 Scholes St, Brooklyn, NY 11237'<\/span>; <\/span>\/\/start address
<\/span>$addressTo <\/span>= <\/span>'6503 Metropolitan Ave, Queens, NY 11379'<\/span>; <\/span>\/\/end address
\/\/ Format address string
<\/span>$formatted_address_from <\/span>= <\/span>str_replace<\/span>(array(<\/span>' '<\/span>,<\/span>'&'<\/span>), <\/span>'+'<\/span>, <\/span>$addressFrom<\/span>);
<\/span>$formatted_address_to <\/span>= <\/span>str_replace<\/span>(array(<\/span>' '<\/span>,<\/span>'&'<\/span>), <\/span>'+'<\/span>, <\/span>$addressTo<\/span>);
<\/span>\/\/ Geocoding API request with start address
<\/span>$geocode_data_start <\/span>= <\/span>file_get_contents<\/span>(<\/span>\"https:\/\/maps.googleapis.com\/maps\/api\/geocode\/json?address=<\/span>{<\/span>$formatted_address_from<\/span>}<\/span>&key=<\/span>{<\/span>$GOOGLE_API_KEY<\/span>}<\/span>\"<\/span>);
<\/span>$outputFrom <\/span>= <\/span>json_decode<\/span>(<\/span>$geocode_data_start<\/span>);
if(!empty(<\/span>$outputFrom<\/span>-><\/span>error_message<\/span>)){
die(<\/span>\"API Error: \"<\/span>.<\/span>$outputFrom<\/span>-><\/span>error_message<\/span>);
}elseif(empty(<\/span>$outputFrom<\/span>-><\/span>results<\/span>[<\/span>0<\/span>])){
die(<\/span>\"Returns empty geodata: \"<\/span>.<\/span>$addressFrom<\/span>);
}
<\/span>\/\/ Geocoding API request with end address
<\/span>$geocode_data_end <\/span>= <\/span>file_get_contents<\/span>(<\/span>\"https:\/\/maps.googleapis.com\/maps\/api\/geocode\/json?address=<\/span>{<\/span>$formatted_address_to<\/span>}<\/span>&key=<\/span>{<\/span>$GOOGLE_API_KEY<\/span>}<\/span>\"<\/span>);
<\/span>$outputTo <\/span>= <\/span>json_decode<\/span>(<\/span>$geocode_data_end<\/span>);
if(!empty(<\/span>$outputTo<\/span>-><\/span>error_message<\/span>)){
die(<\/span>\"API Error: \"<\/span>.<\/span>$outputTo<\/span>-><\/span>error_message<\/span>);
}elseif(empty(<\/span>$outputTo<\/span>-><\/span>results<\/span>[<\/span>0<\/span>])){
die(<\/span>\"Returns empty geodata: \"<\/span>.<\/span>$addressTo<\/span>);
}
<\/span>\/\/ Retrieve latitude and longitude from the geodata
<\/span>$latitude_from <\/span>= <\/span>$outputFrom<\/span>-><\/span>results<\/span>[<\/span>0<\/span>]-><\/span>geometry<\/span>-><\/span>location<\/span>-><\/span>lat<\/span>;
<\/span>$longitude_from <\/span>= <\/span>$outputFrom<\/span>-><\/span>results<\/span>[<\/span>0<\/span>]-><\/span>geometry<\/span>-><\/span>location<\/span>-><\/span>lng<\/span>;
<\/span>$latitude_to <\/span>= <\/span>$outputTo<\/span>-><\/span>results<\/span>[<\/span>0<\/span>]-><\/span>geometry<\/span>-><\/span>location<\/span>-><\/span>lat<\/span>;
<\/span>$longitude_to <\/span>= <\/span>$outputTo<\/span>-><\/span>results<\/span>[<\/span>0<\/span>]-><\/span>geometry<\/span>-><\/span>location<\/span>-><\/span>lng<\/span>;
<\/span>\/\/ Calculate distance between latitudes and longitudes
<\/span>$theta <\/span>= <\/span>$longitude_from <\/span>- <\/span>$longitude_to<\/span>;
<\/span>$dist <\/span>= <\/span>sin<\/span>(<\/span>deg2rad<\/span>(<\/span>$latitude_from<\/span>)) * <\/span>sin<\/span>(<\/span>deg2rad<\/span>(<\/span>$latitude_to<\/span>)) + <\/span>cos<\/span>(<\/span>deg2rad<\/span>(<\/span>$latitude_from<\/span>)) * <\/span>cos<\/span>(<\/span>deg2rad<\/span>(<\/span>$latitude_to<\/span>)) * <\/span>cos<\/span>(<\/span>deg2rad<\/span>(<\/span>$theta<\/span>));
<\/span>$dist <\/span>= <\/span>acos<\/span>(<\/span>$dist<\/span>);