Great way to encrypt and decrypt password, files in PHP?

PHP, , PHP OpenSSL. mcrypt - , , :

$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$key = "This is a very secret key";
$text = "Meet me at 11 o'clock behind the monument.";
echo strlen($text) . "\n";

$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
echo strlen($crypttext) . "\n";

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# the key should be random binary, use scrypt, bcrypt or PBKDF2 to convert a string into a key
# key is specified using hexadecimals
$key = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3");
echo "Key size (in bits): " . $key_size * 8 . "\n";
$plaintext = "This string was AES-256 / CBC / ZeroBytePadding encrypted.";
echo "Plain text: " . $plain_text . "\n";
$ciphertext_base64 = encryptText($key, $plaintext);
echo  $ciphertext_base64 . "\n";


function encryptText(string $key_hex, string $plaintext) {

    # --- ENCRYPTION ---


    # show key size use either 16, 24 or 32 byte keys for AES-128, 192 and 256 respectively
    $key_size =  strlen($key);


    # create a random IV to use with CBC encoding
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);

    # use an explicit encoding for the plain text
    $plaintext_utf8 = utf8_encode($plaintext);

    # creates a cipher text compatible with AES (Rijndael block size = 128) to keep the text confidential 
    # only suitable for encoded input that never ends with value 00h (because of default zero padding)
    $ciphertext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $plaintext_utf8, MCRYPT_MODE_CBC, $iv);

    # prepend the IV for it to be available for decryption
    $ciphertext = $iv . $ciphertext;

    # encode the resulting cipher text so it can be represented by a string
    $ciphertext_base64 = base64_encode($ciphertext);

    return $ciphertext_base64;
}


# === WARNING ===

# Resulting cipher text has no integrity or authenticity added
# and is not protected against padding oracle attacks.

# --- DECRYPTION ---

$ciphertext_dec = base64_decode($ciphertext_base64);

# retrieves the IV, iv_size should be created using mcrypt_get_iv_size()
$iv_dec = substr($ciphertext_dec, 0, $iv_size);

# retrieves the cipher text (everything except the $iv_size in the front)
$ciphertext_dec = substr($ciphertext_dec, $iv_size);

# may remove 00h valued characters from end of plain text
$plaintext_utf8_dec = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);

echo  $plaintext_utf8_dec . "\n";

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function the_awesomest_hash($password)
{
    $salt1 = "awesomesalt!";
    $password = $salt1 . $password;
    for($i = 0; $i < 10000; $i++)
    {
        $password = hash('sha512', $password);
    }
    // Some time has passed, and you have added to your hash function
    $salt2 = "niftysalt!";
    $password = $salt2 . $password;
    for($i = 0; $i < 10000; $i++)
    {
        $password = hash('futuresuperhash1024', $password);
    }
    return $password;
}

, , :

function update_hash($password)
{
    // This is the last part of your the_awesomest_hash() function
    $salt2 = "niftysalt!";
    $password = $salt2 . $password;
    for($i = 0; $i < 10000; $i++)
    {
        $password = hash('futuresuperhash1024', $password);
    }
    return $password;
}

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