- var_dump: documentation ( source)
- memory_get_usage: documentation ( source)
- fclose: documentation ( source)
- tmpfile: documentation ( source)
<?php
var_dump(memory_get_usage());
var_dump(memory_get_usage());
var_dump(memory_get_usage());
$tmp = tmpfile();
var_dump(memory_get_usage());
fclose($tmp);
var_dump(memory_get_usage());