What potential server-side issues could lead to an "out of memory at line 3" error in PHP?

The "out of memory at line 3" error in PHP typically occurs when the server does not have enough memory to handle the script's execution. This could be due to inefficient coding practices, memory leaks, or the script trying to process a large amount of data. To solve this issue, you can try optimizing your code, freeing up memory when it's no longer needed, or increasing the server's memory limit.

// Increase the memory limit in your PHP script
ini_set('memory_limit', '256M');