A.9. memory_limit
To prevent poorly written scripts from consuming all of the available memory, the memory_limit directive can be used to indicate a maximum amount of memory (indicated in bytes or shorthand notation such as 8M).
Although the best value is very application specific, I recommend using the default value of 8M in most cases.
 | The memory_limit directive is available only when PHP is compiled with enable-memory-limit. |
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