check a url is valid or not and valid XML in php
-
23-02-2021 - |
Question
I'm wanted to read a rss feed and store it.for this I m using:-
<?php
$homepage = file_get_contents('http://www.forbes.com/news/index.xml');
$xml = simplexml_load_string($homepage);
echo '<pre>';
print_r($xml);
?>
but first I want to check
1.URL is valid or not ,means if its response time of
$homepage = file_get_contents('http://www.forbes.com/news/index.xml');
is less than 1 minutes and the url address is correct
2.Then check the File(http://www.forbes.com/news/index.xml) have a valid XML data or not. if valid XML then show response time else show error.
answer Of MY QUESTION:
Thanks everybody for your help and suggestion.I solved this problem. for this I wrote this code
<?php
// function() for valid XML or not
function XmlIsWellFormed($xmlContent, $message) {
libxml_use_internal_errors(true);
$doc = new DOMDocument('1.0', 'utf-8');
$doc->loadXML($xmlContent);
$errors = libxml_get_errors();
if (empty($errors))
{
return true;
}
$error = $errors[ 0 ];
if ($error->level < 3)
{
return true;
}
$lines = explode("r", $xmlContent);
$line = $lines[($error->line)-1];
$message = $error->message . ' at line ' . $error->line . ': ' . htmlentities($line);
return false;
}
//function() for checking URL is valid or not
function Visit($url){
$agent = $ch=curl_init();
curl_setopt ($ch, CURLOPT_URL,$url );
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch,CURLOPT_VERBOSE,false);
curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch,CURLOPT_SSLVERSION,3);
curl_setopt($ch,CURLOPT_SSL_VERIFYHOST, FALSE);
$page=curl_exec($ch);
//echo curl_error($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
if($httpcode>=200 && $httpcode<300) return true;
else return false;
}
$url='http://www.forbes.com/news/index.xml';
if (Visit($url)){
$xmlContent = file_get_contents($url);
$errorMessage = '';
if (XmlIsWellFormed($xmlContent, $errorMessage)) {
echo 'xml is valid';
$xml = simplexml_load_string($xmlContent);
echo '<pre>';
print_r($xml);
}
}
?>
Solution
If the url is not valid file_get_contents
would fail.
To check if the xml is valid
simplexml_load_string(file_get_contents('http://www.forbes.com/news/index.xml'))
That would return true if its and would fail entirely if it isn't.
if(simplexml_load_string(file_get_contents('http://www.forbes.com/news/index.xml'))){
echo "yeah";
}else { echo "nah";}
OTHER TIPS
This page has a snippet with a validator for a URL using regular expressions. The function and usage:
function isValidURL($url)
{
return preg_match('|^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$|i', $url);
}
if(!isValidURL($fldbanner_url))
{
$errMsg .= "* Please enter valid URL including http://<br>";
}
if (!filter_var('anyurl',FILTER_VALIDATE_URL))
echo "Wrong url";
end;
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