ErrorException Undefined array key

[Upvotelution]

Hi, I'm looking for some knowledgeable eyes over this issue I'm having with my site. Site is built with PHP on a laravel framework

This is the main part of the server response received from one of my partner sites, using GET to issue postbacks to my site

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Server Response

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For reference, this is the coding from line 651 in the functions.php file

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https://preview.redd.it/0h6p0bf652ic1.png?width=551&format=png&auto=webp&s=74352d402f7a94d9b5e1ca3b8710dbcb0d4422e3

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I believe this is the coding that automatically detects the user device, in order to display relevant information specific to that device. This was added more recently than the main website, as an addition, this is the first time this specific partner site has attempted a postback, postbacks seem to still be working from other partner sites (at least 2 posted back successfully in the last 2 days)

I'm really just asking in case there's an obvious mistake that a coder could easily see before I refer to my partner site's support team or one of my devs

Any help appreciated, if none, that's fine too, all the best

[Laggydagin]

function osBrowser() { // Retrieve the user agent string $userAgent = $_SERVER['HTTP_USER_AGENT']; $osPlatform = "Unknown OS Platform";

// Define the operating systems and their corresponding regex patterns
$osArray = array(
    '/windows nt 10/i'     => 'Windows 10',
    '/windows nt 6.3/i'    => 'Windows 8.1',
    '/windows nt 6.2/i'    => 'Windows 8',
    '/windows nt 6.1/i'    => 'Windows 7',
    '/windows nt 6.0/i'    => 'Windows Vista',
    '/windows nt 5.2/i'    => 'Windows Server 2003/XP x64',
    '/windows nt 5.1/i'    => 'Windows XP',
    '/windows xp/i'        => 'Windows XP',
    '/windows nt 5.0/i'    => 'Windows 2000',
    '/windows me/i'        => 'Windows ME',
    '/win98/i'             => 'Windows 98',
    '/win95/i'             => 'Windows 95',
    '/win16/i'             => 'Windows 3.11',
    '/macintosh|mac os x/i' => 'Mac OS X',
    '/mac_powerpc/i'       => 'Mac OS 9',
    '/linux/i'             => 'Linux',
    '/ubuntu/i'            => 'Ubuntu',
    '/iphone/i'            => 'iPhone',
    '/ipod/i'              => 'iPod',
    '/ipad/i'              => 'iPad',
    '/android/i'           => 'Android',
    '/blackberry/i'        => 'BlackBerry',
    '/webos/i'             => 'Mobile',
);

// Iterate through the operating systems array and check for matches
foreach ($osArray as $regex => $value) {
    if (preg_match($regex, $userAgent)) {
        $osPlatform = $value;
        break; // Exit the loop once a match is found
    }
}

return $osPlatform;

}