saving an output to .xml format - php

Question

I a working on a sample project that gives positions of Telecom operators cell towers based on regions on google maps.
I am following the steps from the google maps API how-to
google maps instructions
i am stuck here. I have followed all the instructions and i am also getting XML output on my webpage from the database. Now as per the instructions that i have to follow, i have to save this output to an .XML file to my server for further processing, and adding markers on the google maps. The markers include the Lat - Long values and some information on the cell towers selected: cell-id, Location code and radio type.
I have searched for the solution but i am stuck at - PHP: DOMDocument::save and how to implement in my code.
The code for the same is attached for reference:
function parseToXML($htmlStr) {
$xmlStr = str_replace('<','<',$htmlStr);
$xmlStr = str_replace('>','>',$htmlStr);
$xmlStr = str_replace('"','"',$htmlStr);
$xmlStr=str_replace("'",''',$xmlStr);
$xmlStr = str_replace('&','&',$htmlStr);
return $xmlStr;
}
$t_query = "SELECT `radio_type`, `lac`,`cell-id`,`longitude`,`latitude` FROM `".DBNAME."`.`celltower` WHERE `mcc` = '".$mcc."' AND `mnc` = '".$mnc."'";
$t_query_exec = mysqli_query($con, $t_query);
if($t_num_rows = 0) {
die("Unable to fetch any data..Please try again..!!");
} else {
header("Content-type: text/xml");
//Begin XML file, echo parent node.
echo '<?xml version="1.0" encoding="utf-8"?>';
echo '<root>';
echo '<markers>';
//Iterating through rows, and printing XML nodes for each
while($t_var = mysqli_fetch_assoc($t_query_exec)) {
//Add to XML document node.
echo '<marker ';
echo 'radio_type="' .parseToXML($t_var['radio_type']) . '" ';
echo 'lac="' .parseToXML($t_var['lac']) . '" ';
echo 'cell-id="' .parseToXML($t_var['cell-id']) . '" ';
echo 'longitude="' . $t_var['longitude'] . '" ';
echo 'latitude="' .$t_var['latitude'] . '" ';
echo '/>';
}
echo '</markers>';
echo '</root>';
}
i just need to know that how can i save the output to an .XML file
Thanks in advance.

Answer 1

Just put your XML into a variable and save it with file_put_contents()
$xmlString = '<?xml version="1.0" encoding="utf-8"?>';
$xmlString .= '<root>';
$xmlString .= '<markers>';
//Iterating through rows, and printing XML nodes for each
while($t_var = mysqli_fetch_assoc($t_query_exec)) {
//Add to XML document node.
$xmlString .= '<marker ';
$xmlString .= 'radio_type="' .parseToXML($t_var['radio_type']) . '" ';
$xmlString .= 'lac="' .parseToXML($t_var['lac']) . '" ';
$xmlString .= 'cell-id="' .parseToXML($t_var['cell-id']) . '" ';
$xmlString .= 'longitude="' . $t_var['longitude'] . '" ';
$xmlString .= 'latitude="' .$t_var['latitude'] . '" ';
$xmlString .= '/>';
}
$xmlString .= '</markers>';
$xmlString .= '</root>';
file_put_contents('output.xml', $xmlString);