[PHP] Strong Encrypt & Decrypt Function + Example of usage

<?php
$password_x = "
+7):;25<%]~78413899672afeec
3736306831e9d13c13a3cw3%N:<
W7L!|E7:_*$[m}341#R4%}f7751
j@^!'&f40<5#e63892cfadbed1c
315f32c55e2888487x2&Q[,4k2{
,&$:e6&:[)'*j&48-H^Y1zO@8xq
";
$key        = pack('H*', $password_x);
$key_x      = base64_encode(substr($password_x, 3, 6)) . pack('H*', sha1(substr($password_x, 5, 10))) . md5($key) . "^#^" . $key;
$password   = $key_x;

function encrypt_x($text)
{
    global $password;
    $key_x             = $password;
    $key_size          = strlen($key_x);
    $plaintext         = $text;
    $iv_size           = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
    $iv                = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $ciphertext        = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key_x, $plaintext, MCRYPT_MODE_CBC, $iv);
    $ciphertext        = $iv . $ciphertext;
    $ciphertext_base64 = base64_encode($ciphertext);
    return $ciphertext_base64;
}

function decrypt_x($text)
{
    global $password;
    $key_x          = $password;
    $ciphertext_dec = base64_decode($text);
    $iv_size        = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
    $iv             = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $iv_dec         = substr($ciphertext_dec, 0, $iv_size);
    $ciphertext_dec = substr($ciphertext_dec, $iv_size);
    $plaintext_dec  = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key_x, $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);
    return $plaintext_dec;
}

$crypt_text   = encrypt_x("sCRiPTz-TEAM.iNFO");
$decrypt_text = decrypt_x($crypt_text);
echo "Encypted: " . $crypt_text . "<br/><br/>";
echo "Decrypted: " . $decrypt_text . "<br/><br/>";
echo "Password: <pre>" . $password . "</pre>";
?>