memory_get_usage

Returns the amount of memory allocated to PHP (PHP 4 >= 4.3.2)
int memory_get_usage ( )

Returns the amount of memory, in bytes, that's currently being allocated to your PHP script.

memory_get_usage() will only be defined if your PHP is compiled with the --enable-memory-limit configuration option.

Example 726. A memory_get_usage() example

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<?php
// This is only an example, the numbers below will
// differ depending on your system

echo memory_get_usage() . "\n"; // 36640

$a = str_repeat("Hello", 4242);

echo memory_get_usage() . "\n"; // 57960

unset($a);

echo memory_get_usage() . "\n"; // 36744

?>

See also memory_limit.

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