(PHP 5 >= 5.2.0, PHP 7, PHP 8)
memory_get_peak_usage — Returns the peak of memory allocated by PHP
memory_get_peak_usage(bool $real_usage = false): int
Returns the peak of memory, in bytes, that's been allocated to your PHP script.
Returns the memory peak in bytes.
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https://www.php.net/manual/en/function.memory-get-peak-usage.php