(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)
mcrypt_module_get_algo_block_size — Returns the blocksize of the specified algorithm
This function has been DEPRECATED as of PHP 7.1.0 and REMOVED as of PHP 7.2.0. Relying on this function is highly discouraged.
mcrypt_module_get_algo_block_size ( string $algorithm [, string $lib_dir ] ) : int
Gets the blocksize of the specified algorithm.
algorithm
The algorithm name.
lib_dir
This optional parameter can contain the location where the mode module is on the system.
Returns the block size of the algorithm specified in bytes.
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https://www.php.net/manual/en/function.mcrypt-module-get-algo-block-size.php