Detailed introduction to md5 values-php Tutorial

This article describes how to obtain the MD5 value of a file in PHP and determine whether the file has been modified. MessageDigestAlgorithmMD5 (the fifth version of the message digest algorithm in Chinese) it is a hash function widely used in the computer security field to provide message integrity protection. if you need it, you can check whether the uploaded file has been modified, you need to record the md5 value of the uploaded file. here we record the method for obtaining the md5 value of the file. & Amp; nbsp; code: if (isset ($ _ FILES [& amp; #3... this article describes how to obtain the MD5 value of a file in PHP and determine whether the file has been modified. Message Digest Algorithm MD5 (the fifth version of the Message Digest Algorithm in Chinese) it is a hash function widely used in the computer security field to provide message integrity protection. if you need it, you can check whether the uploaded file has been modified, you need to record the md5 value of the uploaded file. here we record the method for obtaining the md5 value of the file. The code is as follows: if (isset ($ _ FILES ['multimedia ']) & $ _ FILES ['multimedia'] ['error'] = 0) {$ file_name = $ _ FILES ['multimedia '] ['name']; $ size = get

1. example of PHP obtaining the file's MD5 value and determining whether the file has been modified

Introduction: php traverses the directory to generate the md5 value of each file in the directory and write it to the result file for code sharing.

7. the powerpoint template silently writes a template engine.

Introduction: powerpoint Template: The powerpoint template silently writes a template engine: the engine file code is as follows:

8. php traverses the Directory, generates the md5 value of each file in the directory, and writes it to the result file.

Introduction: php traverses the Directory, generates the md5 value of each file in the directory, and writes it to the result file.

9. I wrote a template engine-PHP Tutorial.

Introduction: I wrote a template engine silently. The engine file code is as follows :? Php/*** The OOP template engine developed silently based on the Discuz template engine. it supports template caching and generates hash md5 values. The template is determined by the hash value.

10. PHP: Get the md5 code of the uploaded file _ PHP Tutorial

Introduction: PHP obtains the md5 code of the uploaded file. To determine whether the uploaded file has been modified, you need to record the md5 value of the uploaded file. here, record the method for obtaining the md5 value of the file. If (isset ($ _ FILES ['multimedia ']) $ _ FILES ['

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The above is a detailed description of the md5 value. For more information, see other related articles in the first PHP community!