PHP - Manual: md5

2024-12-21

metaphone »

« md5_file

md5

(PHP 4, PHP 5, PHP 7, PHP 8)

md5 — 计算字符串的 MD5 散列值

警告

由于此函数依赖的算法已不足够复杂,不推荐使用此函数对明文密码加密。详细内容参见这里。

说明

md5(string $string, bool $binary = false): string

使用 » RSA 数据安全公司的 MD5 消息摘要算法计算 string 的 MD5 散列值，并返回该散列值。

参数

string: 要计算的字符串。
binary: 如果可选的 binary 被设置为 true，那么 md5 摘要将以 16 字符长度的原始二进制格式返回。

返回值

以 32 字符的十六进制数形式返回散列值。

范例

示例 #1 md5() 范例


<?php
$str = 'apple';

if (md5($str) === '1f3870be274f6c49b3e31a0c6728957f') {
    echo "Would you like a green or red apple?";
}
?>

参见

md5_file() - 计算指定文件的 MD5 散列值
sha1_file() - 计算文件的 sha1 散列值
crc32() - 计算一个字符串的 crc32 多项式
sha1() - 计算字符串的 sha1 散列值
hash() - 生成哈希值（消息摘要）
crypt() - 单向字符串散列
password_hash() - 创建密码的散列（hash）

add a note

User Contributed Notes 9 notes

down

Ray.Paseur sometimes uses Gmail ¶

3 years ago


md5('240610708') == md5('QNKCDZO')

This comparison is true because both md5() hashes start '0e' so PHP type juggling understands these strings to be scientific notation.  By definition, zero raised to any power is zero.

down

-2

yiminrong at yahoo dot ca ¶

1 year ago


Regarding Ray Paseur's comment, the strings hash to:

0e462097431906509019562988736854
0e830400451993494058024219903391

The odds of getting a hash exactly matching the format /^0+e[0-9]+$/ are not high but are also not negligible.

It should be added as a general warning for all hash functions to always use the triple equals === for comparison.

Actually, the warning should be in the operators section when comparing string values! There are lots of warnings about string comparisons, but nothing specific about the format /^0+e[0-9]+$/.

down

-3

John ¶

12 years ago


If you want to hash a large amount of data you can use the hash_init/hash_update/hash_final functions.

This allows you to hash chunks/parts/incremental or whatever you like to call it.

down

-15

Shane Allen ¶

19 years ago


From the documentation on Digest::MD5:
md5($data,...)
This function will concatenate all arguments, calculate the MD5 digest of this "message", and return it in binary form.

md5_hex($data,...)
Same as md5(), but will return the digest in hexadecimal form. 

PHP's function returns the digest in hexadecimal form, so my guess is that you're using md5() instead of md5_hex(). I have verified that md5_hex() generates the same string as PHP's md5() function.

(original comment snipped in various places)
>Hexidecimal hashes generated with Perl's Digest::MD5 module WILL
>NOT equal hashes generated with php's md5() function if the input
>text contains any non-alphanumeric characters.
>
>$phphash = md5('pa$$');
>echo "php original hash from text: $phphash";
>echo "md5 hash from perl: " . $myrow['password'];
>
>outputs:
>
>php original hash from text: 0aed5d740d7fab4201e885019a36eace
>hash from perl: c18c9c57cb3658a50de06491a70b75cd

down

-9

Steve M ¶

2 years ago


I've found multiple sites suggesting the code:

md5(file_get_contents($filename));

Until recently, I hadn't noticed any issues with this locally... but then I tried to hash a 700MB file, with a 2048MB memory limit and kept getting out of memory errors...

There appears to be a limit to how long a string the md5() function can handle, and the alternative function is likely more memory efficient anyway. I would highly recommend to all who need file hashing (for detecting duplicates, not security digests) use the md5_file() function and NOT the regular string md5() function!

md5_file($filename);

Note, to those interested, as this was for a local application not a server, I was more concerned with results than memory efficiency. In a live environment, you would never want to read an entire file into memory at once when avoidable. (at the time of coding, I did not know of the alternative function)

down

-23

radon8472 at radon-software dot net ¶

6 years ago


<?php
    function raw2hex($rawBinaryChars)
    {
      return = array_pop(unpack('H*', $rawBinaryChars));
    }
?>

The complement of hey2raw.
You can use to convert from raw md5-format to human-readable format.

This can be usefull to check "Content-Md5" HTTP-Header.

<?php
  $rawMd5    = base64_decode($_SERVER['HTTP_CONTENT_MD5']);
  $post_data = file_get_contents("php://input");

  if(raw2hex($rawMd5) == md5($post_data)) // Post-Data is okay
  else                                    // Post-Data is currupted
?>

down

-14

hkmaly ¶

4 years ago


Note: Before you get some idea like using md5 with password as way to prevent others tampering with message, read pages "Length extension attack" and "Hash-based message authentication code" on wikipedia. In short, naive constructions can be dangerously insecure. Use hash_hmac if available or reimplement HMAC properly without shortcuts.

down

-25

terry _at_ scribendi_com ¶

17 years ago


Do not use the hex strings returned by md5() as a key for MCrypt 256-bit encryption.  Hex characters only represent four bits each, so when you take 32 hex characters, you are only really using a 128-bit key, not a 256-bit one.  

Using an alphanumeric key generator [A-Za-z0-9] will also only provide a 192-bit key in 32 characters.

Two different MD5s concatenated in raw binary form, or mcrypt_create_iv(32,MCRYPT_DEV_RANDOM) will give you a true 256-bit key string.

down

-59

dionyziz at deviantart dot com ¶

14 years ago


Sometimes it's useful to get the actual, binary, md5 digest. 
You can use this function for it:

<?php

function md5bin( $target ) {
    $md5 = md5( $target );
    $ret = '';

    for ( $i = 0; $i < 32; $i += 2 ) {
        $ret .= chr( hexdec( $md5{ $i + 1 } ) + hexdec( $md5{ $i } ) * 16 );
    }

    return $ret;
}

?>

add a note

官方地址：https://www.php.net/manual/en/function.md5.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络数据库 JAVA 面试 NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 PHP 8.1 adodb手册 ADORecordSet对象 opcache预加载 Composer的Packagist资源 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet PHP json解析（json_decode）页面工具 mysql面试题 php 修改图片大小支持php7的性能采集扩展 [原创]诡异的php-fpm超时问题 php中几种注释规范纯php实现DES以及TripleDES加密算法 ADOConnection 公用函数

略微加速

PHP官方手册 - 互联网笔记

md5

说明

参数

返回值

范例

参见

User Contributed Notes 9 notes