What is the memory_get_usage function in PHP used for and how does it relate to variable size?

The memory_get_usage function in PHP is used to retrieve the amount of memory allocated to the PHP script at a specific point in time. This function can be useful for monitoring memory usage and identifying potential memory leaks in your code. It can also help in understanding how the size of variables impacts memory usage.

// Get the memory usage before creating a large variable
$memoryBefore = memory_get_usage();

// Create a large variable
$largeVariable = str_repeat('a', 1000000);

// Get the memory usage after creating the large variable
$memoryAfter = memory_get_usage();

// Calculate the memory used by the large variable
$memoryUsed = $memoryAfter - $memoryBefore;

echo "Memory used by large variable: " . $memoryUsed . " bytes";