(PHP 5 >= 5.2.0, PHP 7)
memory_get_peak_usage — Returns the peak of memory allocated by PHP
$real_usage = FALSE
] ) : intReturns the peak of memory, in bytes, that's been allocated to your PHP script.
real_usage
Set this to TRUE to get the real size of memory allocated from
system. If not set or FALSE only the memory used by
emalloc() is reported.
Returns the memory peak in bytes.