hash( string $algo, string $data[, bool $raw_output = FALSE] ) : string

参数

$algo

算法。可以用 hash_algos() 看当前系统支持的算法，不同的 PHP 版本支持的算法不一样。

var_dump(hash_algos())array (size=46)

0 => string 'md2' (length=3)

1 => string 'md4' (length=3)

2 => string 'md5' (length=3)

3 => string 'sha1' (length=4)

4 => string 'sha224' (length=6)

5 => string 'sha256' (length=6)

6 => string 'sha384' (length=6)

7 => string 'sha512' (length=6)

8 => string 'ripemd128' (length=9)

9 => string 'ripemd160' (length=9)

10 => string 'ripemd256' (length=9)

11 => string 'ripemd320' (length=9)

12 => string 'whirlpool' (length=9)

13 => string 'tiger128,3' (length=10)

14 => string 'tiger160,3' (length=10)

15 => string 'tiger192,3' (length=10)

16 => string 'tiger128,4' (length=10)

17 => string 'tiger160,4' (length=10)

18 => string 'tiger192,4' (length=10)

19 => string 'snefru' (length=6)

20 => string 'snefru256' (length=9)

21 => string 'gost' (length=4)

22 => string 'gost-crypto' (length=11)

23 => string 'adler32' (length=7)

24 => string 'crc32' (length=5)

25 => string 'crc32b' (length=6)

26 => string 'fnv132' (length=6)

27 => string 'fnv1a32' (length=7)

28 => string 'fnv164' (length=6)

29 => string 'fnv1a64' (length=7)

30 => string 'joaat' (length=5)

31 => string 'haval128,3' (length=10)

32 => string 'haval160,3' (length=10)

33 => string 'haval192,3' (length=10)

34 => string 'haval224,3' (length=10)

35 => string 'haval256,3' (length=10)

36 => string 'haval128,4' (length=10)

37 => string 'haval160,4' (length=10)

38 => string 'haval192,4' (length=10)

39 => string 'haval224,4' (length=10)

40 => string 'haval256,4' (length=10)

41 => string 'haval128,5' (length=10)

42 => string 'haval160,5' (length=10)

43 => string 'haval192,5' (length=10)

44 => string 'haval224,5' (length=10)

45 => string 'haval256,5' (length=10)

常用的 md5,sha1,sha256 基本都支持。

demoecho hash('md5','admin');`

//输出:

// 21232f297a57a5a743894a0e4a801fc3

其他

hash_file( string $algo, string $filename[, bool $raw_output = FALSE] ) : string 计算文件的哈希值

hash_hmac( string $algo, string $data, string $key[, bool $raw_output = FALSE] ) : string 用 HMAC 方法算hash，jwt 里面的 hs256 就可以用这个。

hash_hmac_algos( void) : array 返回支持的 hash_hmac 算法

hash_hmac_file( string $algo, string $filename, string $key[, bool $raw_output = FALSE] ) : string 用 HMAC 方法算文件的 hash 。

hash_equals( string $known_string, string $user_string) : bool 比较hash是否相同，这个比直接自己用等号比较更安全。