Guzzle HTTP - Skip if Exception Present or Page Not Found - php

Question

I am trying to create a try/catch loop that I am using for downloading HTML from another website:
foreach($intldes as $id) {
$html = HtmlDomParser::file_get_html('https://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id='.$id);
foreach($html->find('#rightcontent') as $id);
foreach($html->find('.urone p') as $element);
foreach($html->find('.urtwo') as $launchdata);
}
If the data exists, it results in the following HTML:
<p><strong>NSSDCA/COSPAR ID:</strong> 2009-038F</p>
<p>ANDE 2, the Atmospheric Neutral Density Experiment 2, is a pair of microsatellites (Castor and Pollux) launched from Cape Canaveral on STS 127 on 15 July 2009 at 22:03 UT and deployed from the payload bay of the shuttle on 30 July 2009 at 17:22 UT.</p>
<p><strong>Launch Date:</strong> 2009-07-15<br/><strong>Launch Vehicle:</strong> Shuttle<br/><strong>Launch Site:</strong> Cape Canaveral, United States<br/></p>
If the data does not exist, I get a Undefined variable: element error, which means that the DOM Parser could not find the HTML that I want to display.
So I need a something that skips the webpages that do not have the required HTML or a variable of NULL returned.
Basically, if the HTML I want or the variable $element does not exist, I want Guzzle to skip that webpage and not load it.
EDIT:
My full function:
public function tester() {
$intldes = DB::table('examples')->pluck('id');
foreach ($intldes as $query) {
$html = HtmlDomParser::file_get_html('https://example.com?id='.$query);
$elements = $html->find('.urone p', 0);
if (is_array($elements)) {
foreach($html->find('#rightcontent') as $rawid);
foreach($html->find('.urone p') as $rawdescription);
foreach($html->find('.urtwo') as $launchdata);
//-- Data Parser --//
//Intldes
$intldesgetter = strip_tags($rawid->first_child()->next_sibling()->next_sibling()); //Get Element and Remove Tags
$intldesformat = substr($intldesgetter, ($pos = strpos($intldesgetter, ':')) !== false ? $pos + 3 : 0); //Remove Title
$dbintldes = ltrim($intldesformat); //Remove Blank-space
//Description
$description = strip_tags($rawdescription);
$dbdescription = ltrim($description);
//Launch Data
$launchdate = $launchdata->first_child()->next_sibling()->next_sibling()->next_sibling();
$explode = explode("<br/>", $launchdate);
$newArray = array_map(function($v){
return trim(strip_tags($v));
}, $explode);
$dblaunchdate = substr($newArray[0], ($pos = strpos($newArray[0], ':')) !== false ? $pos + 3 : 0);
$dblaunchvehicle = substr($newArray[1], ($pos = strpos($newArray[1], ':')) !== false ? $pos + 3 : 0);
$dblaunchsite = substr($newArray[2], ($pos = strpos($newArray[2], ':')) !== false ? $pos + 3 : 0);
//Data Saver
DB::table('descriptions')->insert(
['intldes' => $dbintldes, 'description' => strip_tags($dbdescription), 'launch_date' => $dblaunchdate, 'launch_vehicle' => $dblaunchvehicle, 'launch_site' => $dblaunchsite]
);
echo "Success";
} else {
echo "$query does not exist";
continue;
};
}
}

Answer 1

I think you are getting error here in your code:
foreach($html->find('.urone p') as $element);
From my experience, I would recommend to you that you should check for the availability of the HTML tag first before iterating in the foreach loop.
You can use either is_object() or is_array() to get work around your problem. When you search for a single element, an object is returned. When you search for a set of elements, an array of objects is returned.
As you are searching for set of elements then you can use
$elements = $html->find('.urone p');
if (is_array($elements)) {
//continue
}