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<?php

$password = 'mypassword';

$key1 = "khgfewtyui89283764treyduhjzksjahdgfret6738q29iojashdgftye7w8q9ioakjshdgfyrew8uioqwuehgyrfyewuiqouehgdfeyw78q9iowue8y7648392qiowushdgfshajk";
$hash1 = crypt($password, $key1);

$key2 = "1fc05cc1ef0d5081f34ed3aac483e39e";
$hash2 = crypt($password, $key2);

// Now the backend will try to verify the password
if (hash_equals($hash1, crypt('mypassword', $hash1))) {
   echo "Password for hash 1 verified!\n";
}

if (hash_equals($hash2, crypt('mypassword', $hash2))) {
   echo "Password for hash 2 verified!\n";
}

// Lets try to use password_verify
if (password_verify('mypassword', $hash1)) {
    echo "Password for hash1 verified\n";
}

if (password_verify('mypassword', $hash2)) {
    echo "Password for hash2 verified\n";
}