Php Hash（）函数在wordpress模板中不起作用

我正在尝试添加支付网关，但无法哈希字符串

<?php
/**
 * Template Name: Payment
 *
 * @link    https://codex.wordpress.org/Template_Hierarchy
 *
 * @package Mitech
 * @since   1.0
 */

get_header();
?>
<?php 
$email = $_GET['email'];
$Price = $_GET['asdcsa'];



// How to calculate request signature.
$shaString  = '';
// array request
$arrData    = array(
'command'            =>'AUTHORIZATION',
'access_code' => 'WboNsNukQq6CpM5sFTb6',
'merchant_identifier' => 'oZCzyQtx',
'merchant_reference' => 'XYZ9239-yu898',
'amount'             =>'10000',
'currency'           =>'AED',
'language'           =>'en',
'customer_email'     =>'test@payfort.com',
'order_description'  =>'iPhone 6-S',
);
// sort an array by key
ksort($arrData);
foreach ($arrData as $key => $value) {
    $shaString .= "$key=$value";
}
// make sure to fill your sha request pass phrase.
$shaString = "$2y$10$XPu7h2ekY" . $shaString . "$2y$10$XPu7h2ekY";
$signature = hash("SHA-256", $shaString);


echo $signature;

使用“而不是”，否则它将尝试将字符串解析为变量，如

$shaString='$2y$10$XPu7h2ekY.$shaString'$2y$10$XPu7h2ekY'；

此外，
hash（）
方法的正确参数是
“sha256”
，而不是我在文档中看到的SHA-256

编辑：
此外，为了避免重复错误并使代码更具可读性，我建议为
'$2y$10$XPu7h2ekY'