Why does this simple php script leak memory?

Question

In hopes of trying to avoid future memory leaks in php programs (drupal modules, etc.) I\'ve been messing around with simple php scripts that leak memory.

Could a ph

Answer 1

memory_get_usage() does not returns the immediate memory usage, but stored memory to run the process. IN the case of a huge array unset($array_a) will not release memory but consume more according to the memory_get_usage() in my system...

$array_a="(SOME big array)";
$array_b="";
//copy array_a to array_b
for($line=0; $line<100;$line++){
$array_b[$line]=$array_a[$line];
}

unset($array_a); //having this shows actually a bigger consume
print_r($array_b);

echo memory_get_usage();