Breve descrizione dei parametri di configurazione.
This sets the maximum amount of memory in bytes that a script is allowed to allocate. This helps prevent poorly written scripts for eating up all available memory on a server. In order to use this directive you must have enabled it at compile time. So, your configure line would have included: --enable-memory-limit. Note that you have to set it to -1 if you don't want any limit for your memory.
As of PHP 4.3.2, and when memory_limit is enabled, the PHP function memory_get_usage() is made available.
See also: max_execution_time.