I use md5(), but what is better that md5

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I believe you mean hashing instead of encrypting? There are other hashing algorithms such as SHA1 and SHA256 that would be considered stronger than MD5.

Thank you

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Yes using the crypt() function is probably the recommended course of action nowadays. It is supported in 5.3 I think which is what your servers should be on. It's pretty simple to use as well.

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