The openssl_encrypt() and openssl_decrypt() functions can be used to encrypt and decrypt text in PHP.
They are useful to encrypt and decrypt the user password in a register /login script.

- Here is a simple example with the openssl_encrypt() and openssl_decrypt() functions.
<?php
$password = 'user_pass'; //password added by user $_POST['password']
$key_enc = '1234'; //key for encrypt
$met_enc = 'aes256'; //method to encrypt: aes128, aes192, aes256, blowfish, cast-cbc
$iv = '16_characters_ok'; //a random string with 16 characters

//encrypts the password
$pass_enc = openssl_encrypt($password, $met_enc, $key_enc, 0, $iv);
echo $pass_enc; // "uw4QKRUsG+l17w5epb7nKw=="

//decrypts the encrypted password, it uses the same arguments: $met_enc, $key_enc, $opt=0, $iv
$pass_enc ='uw4QKRUsG+l17w5epb7nKw=='; //the encrypted password
$pass = openssl_decrypt($pass_enc, $met_enc, $key_enc, 0, $iv);
echo '<br>'.$pass; // "user_pass"
?>

Notice, the openssl_decrypt() must use the same arguments (here: $met_enc, $key_enc, $opt=0, $iv) to decrypt the string encrypted with openssl_encrypt().

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Using openssl_encrypt and openssl_decrypt in PHP

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