- memory_get_usage: documentation ( source)
- md5: documentation ( source)
<?php
$array = array();
print memory_get_usage(true) . PHP_EOL;
$array['key1'] = md5('val1');
print memory_get_usage(true) . PHP_EOL;
$array['key2'] = 'val2';
print memory_get_usage(true) . PHP_EOL;
$array['key3'] = 'val3';
print memory_get_usage(true) . PHP_EOL;