Why doesn't PHP show my custom error message when mysqli_connect fails?

This is the code:

$query = "SELECT * FROM amz WHERE asin = '$asin' LIMIT 1";
$q = mysqli_query($con, $query) or trigger_error(file_put_contents('wth_ama.txt', $query), E_USER_ERROR);

In the error docs I sometimes get this error:

Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ''B07P8P6D7V'' LIMIT 1'

Why is trigger_error not creating the wth_ama.txt file?

And about the error, does it mean that asin literally contain "'B07P8P6D7V'" and not "B07P8P6D7V"? If yes then it actually shouldn’t happen.

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