(PHP 4 >= 4.3.2, PHP 5, PHP 7)
memory_get_usage — Returns the amount of memory allocated to PHP
memory_get_usage ([ bool $real_usage = false ] ) : int
Returns the amount of memory, in bytes, that's currently being allocated to your PHP script.
real_usage
Set this to true to get total memory allocated from system, including unused pages. If not set or false only the used memory is reported.
Note:
PHP does not track memory that is not allocated by
emalloc()
Returns the memory amount in bytes.
Example #1 A memory_get_usage() example
<?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
?>
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https://www.php.net/manual/en/function.memory-get-usage.php