如何在javascript中使用php

Question

I have created a variable ($latlon) in php via an sql query like so...

// ...
if ($result->num_rows >0) {
    while ($row = $result->fetch_assoc()) {
        echo "id: " . $row["userid"] . latitude: . $row["latitude"] . 
        longitude: . $row["longitude"] ;

         $latlon = $row["latitude"] . "," . $row["longitude"];

and now i would like to use either the variable $latlon or $row["latitude"] & $row["longitude"] in some javascript code that displays a map which looks like this. Ideally i would like my php variable to go in here (51.508742,-0.120850) because these coords will continually change.

<script>
function initialize()
{
    var mapProp = {
        center: new google.maps.LatLng**(51.508742,-0.120850)**,
        zoom:7,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
}

function loadScript()
{
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.src = "http://maps.googleapis.com/maps/api/
    js?key=&sensor=false&callback=initialize";
    document.body.appendChild(script);
}
window.onload = loadScript;
</script>

any help will be appreciated. thank you

Answer 1

You should echo the $latlon variable inside php tag. So the line will be as following: new google.maps.LatLng(<?php echo $latlon;?>). I assume you have the correct syntax for the js in the php $latlon variable.

Remember, this will only work if it is a php file you are placing the code on.