How do you Encrypt and Decrypt a PHP String?

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What I mean is:

Original String + Salt or Key --> Encrypted String
Encrypted String + Salt or Key --> Decrypted (Original String)

Maybe something like:

"hello world!" + "ABCD1234" --> Encrypt --> "2a2ffa8f13220befbe30819047e23b2c" (may be, for e.g)
"2a2ffa8f13220befbe30819047e23b2c" --> Decrypt with "ABCD1234" --> "hello world!"
  • In PHP, how can you do this?

Attempted to use Crypt_Blowfish, but it didn’t work for me.

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