尝试为bcrypt哈希算法指定成本基准时出现解析错误？

Question

Can't figure out why i get a parse/syntax error in my code, it works on my localhost server, but when i upload it to my webhost i get a syntax error: "unexpected '[' on line 3".

I have a paste-link here: http://codepad.org/26K93MPG

Here's my code:

<?php

$options = [
    'cost' => 9,
];

$unhashedPassword = 'testingtesting';
$hashedPassword = password_hash($unhashedPassword, PASSWORD_BCRYPT, $options);

echo $unhashedPassword . "<br>";
echo $hashedPassword;

?>

FIXED! Here's how i fixed it, and a short explanation about what went wrong:

Firstly, My localhost server's PHP Version was 5.6.4, and my production server's PHP Version was 5.3.29. Since the password_hash() function was first introduced in Version 5.3.7, its obvious that it didnt work.

Secondly, the array syntax that i was using was only allowed in PHP Version 5.3 or older. But the old syntax didnt make it work either, but that was because the password_hash() function wasnt implemented in PHP at that time either.

To fix both problems:

1) Go to https://github.com/ircmaxell/password_compat/blob/master/lib/password.php

2) Put this library file into your folder, and include password.php in your login procedure.

3) change the array syntax to this, it's nice and neat:

<?php
include("password_hash_compatibility.php");

$unhashedPassword = 'testingtesting';
$hashedPassword = password_hash($unhashedPassword, PASSWORD_BCRYPT, array("cost" => 9));

echo $unhashedPassword . "<br>";
echo $hashedPassword;

?>

Answer 1

Your production server is running PHP 5.3 or older and thus does not offer array shorthand syntax which was introduced in PHP 5.4 . Just use the "old" array syntax for backwards compatibility:

$options = array(
    'cost' => 9,
);

This is why you should always make sure your development environment matches your production environment as closely as possible.