I am following this tutorial from google for google maps:

https://developers.google.com/maps/articles/phpsqlajax_v3?hl=es

I formatted my code as so:

echo '<markers>';

// Iterate through the rows, adding XML nodes for each
for($i = 0; $i< $breweryNum; $i++ ){

    echo '<marker ';
    echo 'name="' . parseToXML($row['beerBrewery']) . '" ';
    echo 'lat="' . $row['lat'] . '" ';
    echo 'lng="' . $row['longi'] . '" ';
    echo '/>';

}

// End XML file
echo '</markers>';

But when I run the php file to test my xml, I get this:

XML Parsing Error: not well-formed
Location: http://beerportfolio.com/getMapMarkers.php
Line Number 1, Column 18:<markers><marker <br />
-----------------^

Are you use nl2br or some to output resulting string?

It's clear error message, after "<markers><marker" outputs tag "<br />" but here should be your "name" attribute. Anyway, you can use following code to not output wrong things:

$out = '<markers>';
for($i = 0; $i< $breweryNum; $i++ ){

    $out .= '<marker ';
    $out .= 'name="' . parseToXML($row['beerBrewery']) . '" ';
    $out .= 'lat="' . $row['lat'] . '" ';
    $out .= 'lng="' . $row['longi'] . '" ';
    $out .= '/>';

}
$out .= '</markers>';

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