(PHP 5 >= 5.2.0)
memory_get_peak_usage — Returns the peak of memory allocated by PHP
$real_usage = false
  ] )Returns 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.
| Version | Description | 
|---|---|
| 5.2.1 | Compiling with --enable-memory-limit is no longer required for this function to exist. | 
| 5.2.0 | real_usagewas added. |