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@ 2017-01-22T17:12:37Z

<?php

        $textToEncrypt = "Secret Text to Encrypt";
        $encryptionMethod = 'aes-256-cbc';
        $secretHash = "315a5504d921f8327f73a356d2bbcbf1"; // <---- you have to use some persistent.

        $iv_size = openssl_cipher_iv_length($encryptionMethod );
        $iv = openssl_random_pseudo_bytes($iv_size);

        //To encrypt
        $encryptedMessage = openssl_encrypt($textToEncrypt, $encryptionMethod, $secretHash, 0, $iv);

        //Concatenate iv with data
        $encryptedMessageWithIv = bin2hex($iv) . $encryptedMessage;

        //To Decrypt
        $iv_size = openssl_cipher_iv_length($encryptionMethod );
        $iv = hex2bin(substr($encryptedMessageWithIv, 0, $iv_size*2));

        $decryptedMessage = openssl_decrypt(substr($encryptedMessageWithIv, $iv_size*2), $encryptionMethod, $secretHash, 0, $iv);

        echo "Encrypted: $encryptedMessageWithIv <br>Decrypted: $decryptedMessage";

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Call to undefined function openssl_cipher_iv_length() in /in/r9pYv:7 Stack trace: #0 {main} thrown in /in/r9pYv on line 7
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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