php md5 file

Use the MD5 conversion algorithm to prevent brute force cracking. MD5 is the most common cryptographic algorithm in Web applications. Because MD5 is irreversible, the ciphertext obtained after MD5 calculation cannot be obtained through reverse

MD5 is the most common cryptographic algorithm in Web applications. Because MD5 is irreversible, the ciphertext obtained after MD5 calculation cannot be obtained through reverse algorithms. Looking back at the original intention of using MD5 to

Php Chinese network (www.php.cn) provides the most comprehensive basic tutorial on programming technology, introducing HTML, CSS, Javascript, Python, Java, Ruby, C, PHP, basic knowledge of MySQL and other programming languages. At the same time,

The scenario for generating a unique ID is very common, such as temporary cache file names, temporary variables, temporary security codes, and so on, and the uniqid () function generates a unique ID based on the current time in microseconds. Because

Conversion | algorithm MD5 is the most commonly used cryptographic encryption algorithm in Web applications. Since the MD5 is irreversible, the ciphertext after MD5 calculation can not get the original text through the reverse algorithm. The

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

PHP obtains the file md5 and checks whether the file is modified ,. PHP obtains the md5 value of the file and checks whether the file has been modified. to determine whether the uploaded file has been modified, it is necessary to record the md5

This article mainly introduces PHP to get the MD5 value of the file and to determine whether it was modified, message Digest algorithm MD5 (Chinese named message Digest algorithm fifth version) for the computer security field widely used a hash

Use PHP to download pictures when encountering MD5 problems, the source image through http://su.bdimg.com/static/superplus/img/logo_white_ee663702.pngDownload The original image and curl get the same MD5 as the picture source, but not after using

0 reply content: first, at least there is no need to read the entire file into the memory. For example, in php, md5 (file_get_contents (big_file_name) is indeed inappropriate. Because md5 is calculated every 512 bits as a chunk. Therefore, you can