Command Line Memory Problem

[richid]

Hey all,

I'm having a problem running a script from the command line.  For context, I'm getting a list of ~20k items from a DB, iterating through and making 2 calls to a remote API for each item.  The first call is to get the description, and the second call is to update the information.  The problem is, after each iteration the memory usage keeps increasing. I've unset all applicable variables and I am not making any other calls, but I can't seem to figure out where the problem is.  I've also tried using get_defined_vars(), and the only one returned is the $ids array.

Here is my code:
[code]
$count = count($ids);
for($i = 0; $i < $count; $i++) {

print "start_loop_mem:\t\t" . (memory_get_usage() / 1024 / 1024) . " MB\n";

$api = new api();
$result = $api->get_item($ids[$i]['id']);
$desc = $result['Item']['Description'];
unset($result);

print "after_api_call_mem:\t" . (memory_get_usage() / 1024 / 1024) . " MB\n";

if($ids[$i]['shipping'] == 0) {
$desc = preg_replace("@Shipping@is", "Free Shipping" ", $desc);
} else {
$desc = preg_replace("@Shipping@is", $ids[$i]['shipping'], $desc);
}

$desc = preg_replace("@Price", $ids[$i]['price'], $desc);

$update_args = array('Price' => $ids[$i]['price'],
'Description' => '<![CDATA[' . $desc . ']]>',
'Shipping' => $ids[$i]['shipping']);

print "after_update_args_mem:\t" . (memory_get_usage() / 1024 / 1024) . " MB\n";

$result = $api->update_item($ids[$i]['id'], $update_args);

print "bottom_loop_mem:\t" . (memory_get_usage() / 1024 / 1024) . " MB\n";

unset($api);
unset($result);
unset($ids[$i]);
unset($update_args);
unset($desc);
[/code]

And here are the results:
[code]
start_loop_mem:            7.9615097045898 MB
after_api_call_mem:        8.0777969360352 MB
after_update_args_mem:  8.1437377929688 MB
bottom_loop_mem:          8.1848983764648 MB

start_loop_mem:          8.1417083740234 MB
after_api_call_mem:      8.242057800293 MB
after_update_args_mem: 8.3129806518555 MB
bottom_loop_mem:        8.3567886352539 MB

start_loop_mem:            8.3102798461914 MB
after_api_call_mem:      8.4185485839844 MB
after_update_args_mem: 8.494987487793 MB
bottom_loop_mem:        8.5417327880859 MB
[/code]

As you can see, it will continue on like this until memory_limit is reached and error out. Any ideas or help as to what could be causing this would be greatly appreciated!

Thanks,
Rich