php 未定义的函数 sha256()

Undefined function sha256()

提问by H Bellamy

I have this php code:

我有这个 php 代码：

$password = sha256($_POST['password']);

but when I run this code it says:

但是当我运行这段代码时，它说：

Fatal error: Call to undefined function sha256() in .... on line ...ix it as 

What is wrong with this code and what must I do to fix this as I know that sha256exists.

这段代码有什么问题，我必须做些什么来解决这个问题，因为我知道它sha256存在。

I have also tried:

我也试过：

$password = sha256(trim($_POST['password']));

But that doesn't work either.

但这也行不通。

回答by DarkDevine

You can use

您可以使用

hash( 'sha256', $string );

See http://de.php.net/manual/de/function.hash.php

见http://de.php.net/manual/de/function.hash.php

回答by Goran Miskovic

The Suhosinextension adds the function sha256(), and even sha256_file(), to the PHP Core.

该了Suhosin扩展增加了功能sha256()，甚至sha256_file()，到PHP核心。

With the extension installed:

安装扩展程序后：

<?php
var_dump(function_exists('sha256'));
?>

bool(true)

回答by Wieszos

There is no such function in php standard library. Use hashfunction instead. http://php.net/manual/en/function.hash.phplike :

php标准库中没有这样的功能。改用hash函数。 http://php.net/manual/en/function.hash.php像：

$pass = hash('sha256', $_POST['password']);

回答by Berry Langerak

ehrm. That function doesn't exist. If you want to use the SHA256 algorithm, use hashinstead.

嗯。该功能不存在。如果要使用 SHA256 算法，请改用哈希。