PHP str_replace() Passing null to parameter #3 ($subject) of type arraystring is deprecated error

$output = $output ? str_replace(array('{elapsed_time}', '{memory_usage}'), array($elapsed, $memory), $output): "";

The error message you're seeing indicates that you're passing a null value to the $subject parameter of the str_replace() function in PHP, and this is deprecated behavior.

The str_replace() function is used to replace occurrences of a search string with a replacement string within a given subject string. It seems like you might be accidentally passing a null value to the function, and this is no longer allowed.
To fix this issue, you need to make sure that you're passing a valid string as the $subject parameter. Here's the basic syntax of the str_replace() function:

str_replace($search, $replace, $subject);

$search: The string you want to search for.
$replace: The string you want to replace $search with.
$subject: The string in which you want to perform the replacement.
Make sure that the $subject parameter is not null and is a valid string before calling the str_replace() function. If you're still facing issues, you might want to double-check your code to ensure that you're providing the correct values to the function.

If you provide more context or code, I'd be happy to help you troubleshoot further.

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