How to perform two way encryption using PHP

Overview

When we apply both the encryption and decryption functions to some data, we call it two-way encryption. In PHP, we can use the following two functions to perform two-way encryption.

  • base64_encode()

  • base64_decode()

The base64_encode function

We can use the base64_encode function to encode the given data or string with the base 64.

Syntax

string base64_encode ( string $array )

Parameters

  • array: This is the array or string we need to encode.

Return type

This function will return the encoded data of a given string.

Example

<?php  
    $arr = "Encrypted String";  
    $temp = base64_encode($arr);  
    echo $temp;  
?>

Explanation

  • Line 2: We declare a string and store data in it.
  • Line 3: We call the encryption function and pass the string to the function.
  • Line 4: We print the encrypted string.

The base64_decode function

We can use the base64_decode function to decode the base 64 encoded data.

Syntax

string base64_decode ( string $array)

Parameters

  • array: This is the data we need to decode.

Return type

This function will return the decoded data.

Example

<?php  

    $str = 'RW5jcnlwdGVkIFN0cmluZw==';  

    echo base64_decode($str);  

?>

Explanation

  • Line 2: We declare a string and store encrypted data in it.

  • Line 3: We call the decryption function and pass the string to the function.

  • Line 4: We print the decrypted string.

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