What are potential pitfalls of not properly managing memory usage in PHP scripts?

Not properly managing memory usage in PHP scripts can lead to memory leaks, decreased performance, and potential crashes. To avoid these pitfalls, it is important to free up memory by unsetting variables and closing database connections when they are no longer needed.

// Example of properly managing memory usage in PHP scripts

// Initialize a large array
$largeArray = range(1, 1000000);

// Process the array
foreach ($largeArray as $value) {
    // Do some processing
}

// Free up memory by unsetting the large array
unset($largeArray);