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ecb (electronic codebook) is suitable for random data, such as encrypting other keys. since data there is short and random, the disadvantages of ecb have a favorable negative effect.
mcrypt_mode_ecb (electronic codebook) は、他のキーを暗号化すると いったランダムデータに適しています。出力データが短くランダムであ るというecbの短所は、都合の良い逆の効果を持っています。

built-in modules are compiled directly into php and carried around with every php process; their functionality is instantly available to every script that's being run. like external modules, built-in modules have advantages and disadvantages, as described in the following table:
built-in modules are compiled directly into php and carried around with every php process; their functionality is instantly available to every script that's being run. like external modules, built-in modules have advantages and disadvantages, as described in the following table: