How can the issue of a jQuery AJAX call malfunctioning due to the PHP 8.X update be resolved when it produces an Uncaught TypeError: array_key_exists() error?

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The issue can be resolved by updating the code that is responsible for processing the AJAX call. The Uncaught TypeError: arraykeyexists() error occurs when the PHP function arraykeyexists() is called with incorrect parameters. This function has been changed in PHP 8.0, and now requires two parameters instead of one.

To fix the issue, update the code that is making the AJAX call to include the second parameter for arraykeyexists(). For example, if the original code looked like this:

if (array_key_exists('key', $_POST)) {
   // process data
}

Then the updated code should look like this:

if (array_key_exists('key', $_POST, true)) {
   // process data
}

Note that the third parameter, which is set to true, is required to enforce strict data type checking. This parameter was optional in earlier versions of PHP but is now required in PHP 8.0.

After updating the code, test the AJAX call again to ensure that it is functioning properly.