[php-src] Issue #8120: mysqli blank error

Issue: https://github.com/php/php-src/issues/8120 Comment Author: kamil-tekiela 1. You should never have error reporting turned off in production. You should have display_errors = 0 in production and you should log the errors instead. 2. You misidentified the error. It does not come from the code you posted. If you check the full error message you will see that the message is pointing to one of the mysqli functions. 3. In PHP 8.1 the default error reporting mode in mysqli changed from silent to exceptions. This is why you haven't seen the error before, you were silencing them all. The error was always there. 4. Retrieving just the last line of the output is not going to help you identify problems. exec has the out-parameter called $output. Use that.