How can one troubleshoot and optimize PHP scripts to avoid memory consumption and performance issues?

To troubleshoot and optimize PHP scripts to avoid memory consumption and performance issues, you can start by identifying any memory leaks or inefficient code that may be causing the problems. Use tools like Xdebug to profile your code and identify bottlenecks. Additionally, consider optimizing your code by using efficient algorithms, avoiding unnecessary database queries, and implementing caching mechanisms.

// Example code snippet to optimize memory consumption by using efficient algorithms
// Original code
$numbers = range(1, 1000000);
$sum = 0;
foreach ($numbers as $number) {
    $sum += $number;
}
echo $sum;

// Optimized code
$sum = (1000000 * (1000000 + 1)) / 2;
echo $sum;