Possible MySQL sudden error - php

Question

Hello friends from SO!
Alright, this time I have a little bit more complex problem. We have a web crawler running and functioning normally during most of the day and time.
However, from time to time, it just stops: the link which is supposed to be analyzed next, never change it's state (from pending to scanning), and of course this stops the whole cycle.
We're logging all PHP errors using:
//errores producción
#ini_set('error_reporting', -1);
#ini_set('log_errors','On');
#ini_set('display_errors','Off');
#ini_set('error_log','/var/www/vhosts/xxx.com/xxx.com/xxx');
There's no evidence of anything that could cause the problem described. 0 anomalies.
Therefore, I believe the problem might be related to some kind of MySQL issues?
Every single MySQL query we do, is done using MySQLi by custome made functions, so my question here is:
Is there any simple approach to record every single MySQL error on the same file where we are storing the PHP errors?
Here are some of the functions used to query the MySQL:
Function db_ob($db_link, $ask) {
$feedback = mysqli_fetch_object(mysqli_query($db_link, $ask));
return $feedback;
}
and:
Function db_ob_all($db_link, $ask) {
$feedback = mysqli_query($db_link, $ask);
while ($row = mysqli_fetch_object($feedback)) { $value[] = $row; }
return $value;
}
So what I'm looking for, is a one or two lines solution, that I could add into these functions, in order to store and track any issue or error in the same file where I'm currently storing the PHP errors.
Thanks in advance!
Chris;

Answer 1

Solved:
1) make a function to track the errors into the PHP error_log:
Function informar_error_db($db_link) {
error_log("Dreadful SQL error: ". mysqli_error($db_link)." in ".$_SERVER["SCRIPT_FILENAME"]);
}
2) If there's MySQLi issues, save em:
Function db_ask($db_link, $ask) {
$feedback = mysqli_query($db_link, $ask);
if (mysqli_error($db_link)) { informar_error_db($db_link); }
return $feedback;
}
Here:
if (mysqli_error($db_link)) { informar_error_db($db_link); }