如何将span id值存储到PHP变量中

var spanId = document.getElementById('your-span-id').id;

$.ajax({
    url: 'your-php-file.php',
    type: 'POST',
    data: {spanId: spanId},
    success: function(response) {
        // 成功发送数据后的操作
    },
    error: function(xhr, status, error) {
        // 发生错误时的操作
    }
});

$spanId = $_POST['spanId'];