What debugging techniques can be used to troubleshoot issues with PHP scripts, particularly when using the exit() function?

When troubleshooting PHP scripts that use the exit() function, one common issue is that the script terminates abruptly, making it difficult to pinpoint the problem. To address this, you can use debugging techniques such as error logging, using var_dump() or print_r() to inspect variables before calling exit(), and using conditional statements to control the flow of the script.

// Example of using error logging to troubleshoot PHP scripts with exit()

// Enable error logging
ini_set('display_errors', 0);
ini_set('log_errors', 1);
ini_set('error_log', 'error.log');

// Sample code with exit()
$var = 10;
if ($var > 5) {
    echo "Variable is greater than 5.";
} else {
    error_log("Variable is not greater than 5.");
    exit();
}