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# mcrypt_module_self_test

(PHP 4 >= 4.0.2)

mcrypt_module_self_test -- This function runs a self test on the specified module

## Description

``bool mcrypt_module_self_test` (string algorithm [, string lib_dir])`

This function runs the self test on the algorithm specified. The optional `lib_dir` parameter can contain the location of where the algorithm module is on the system.

The function returns `TRUE` if the self test succeeds, or `FALSE` when if fails.

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