Description
int 
memory_get_usage ( void  )
     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 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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     See also 
     memory_limit.