PHP md5解释 [英] PHP md5 explained

问题描述

我正在从事这个PHP项目，并且在很多地方都在使用md5.我什至使用了很多次，但是直到今天我仍不清楚该函数在做什么.我意识到它会解密传入的值，但是撤消它以将其恢复为原始值该怎么办.也许我不清楚整个过程，如果有人知道该过程的信息，我将不胜感激

I am working on this PHP project and I have many places that an md5 is being used. I have even used it many times, but still today I am unclear on what the function is doing. I realize it decrypts the value passed in but what about undoing it to get it back to the original. Maybe i am not clear about the whole process and if anyone has information about the process I would highly appreciate it

推荐答案

md5是哈希函数

它只能以一种方式工作.

哈希函数是任何定义明确的 程序或数学函数 可以转换较大的，可能是 将可变大小的数据量转换为 小基准.由a返回的值 哈希函数称为哈希值， 哈希码，哈希和，校验和或 只是散列.

A hash function is any well-defined procedure or mathematical function that converts a large, possibly variable-sized amount of data into a small datum. The values returned by a hash function are called hash values, hash codes, hash sums, checksums or simply hashes.

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