PHP encryption symmetric program example using crypt to store password in a text file

Here is an example of a PHP program that uses the crypt function to symmetrically encrypt a password and store it in a text file:

<?php

// Prompt the user for a password
$password = readline("Enter a password: ");

// Encrypt the password using the crypt function
$encryptedPassword = crypt($password);

// Open a file for writing
$file = fopen("password.txt", "w");

// Write the encrypted password to the file
fwrite($file, $encryptedPassword);

// Close the file
fclose($file);

echo "Encrypted password saved to password.txt\n";

?>

This program prompts the user to enter a password and then uses the crypt function to encrypt it. The encrypted password is then written to a file called password.txt.

It's important to note that the crypt function is not a secure way to encrypt passwords. It uses a very basic encryption algorithm that can easily be broken. For secure password storage, it is recommended to use a more secure encryption algorithm such as AES or PBKDF2, and to store the encrypted password in a database rather than a plain text file.