如何将十六进制转换为二进制值

Question

我有这样的价值

function prepLogin ($id, $username, $remember, $email){
    $_SESSION['id'] = $id;
    $_SESSION['username'] = $username;
    $_SESSION['email'] = $email;

    $fingerprint = md5($_SERVER['REMOTE_ADDR'] . $_SERVER['HTTP_USER_AGENT']);
    $_SESSION['last_active'] = time();
    $_SESSION['fingerprint'] = $fingerprint;

    if($remember === "yes"){
        rememberMe($id);
    }
    //call sweet alert 
    //echo 'REACHED PREP LOGIN'.'<br>';
    echo $welcome = "<script type=\"text/javascript\">
                            swal({
                            title: \"Welcome back $username!\",
                            text: \"You're being logged in.\",
                            type: 'success',
                            timer: 3000,
                            showConfirmButton: false });
                            setTimeout(function(){
                               window.location.href = '../../index.php';
                            }, 3000);
                        </script>";
}

此值的二进制表示为

1111 1111 1111 0111 1011 1011 1111 1111

如何在PHP中将此FFF7BBFF 转换为二进制文件？我无法在网上找到这个公式？

我试过这个

FFF7BBFF

但它不起作用。它显示了这个

Answer 1

base_convert是要使用的函数：http://php.net/manual/en/function.base-convert.php

$hexadecimal="FFF7BBFF";

echo base_convert($hexadecimal, 16, 2);

输出：

11111111111101111011101111111111

如果你真的想要这种格式..

$new=base_convert($hexadecimal, 16, 2);
$split = str_split($new, 4);
echo implode(' ', $split);

输出：

1111 1111 1111 0111 1011 1011 1111 1111