note 88021 added to function.md5

Before using MD5 for anything, please be aware that this hash function is cryptographically broken and should not be used. There are alternatives such as SHA-1. Read http://www.kb.cert.org/vuls/id/836068 and note the following paragraph: "Do not use the MD5 algorithm Software developers, Certification Authorities, website owners, and users should avoid using the MD5 algorithm in any capacity. As previous research has demonstrated, it should be considered cryptographically broken and unsuitable for further use." ---- Server IP: 212.124.37.9 Probable Submitter: 85.177.210.203 ---- Manual Page -- http://www.php.net/manual/en/function.md5.php Edit -- https://master.php.net/note/edit/88021 Del: integrated -- https://master.php.net/note/delete/88021/integrated Del: useless -- https://master.php.net/note/delete/88021/useless Del: bad code -- https://master.php.net/note/delete/88021/bad+code Del: spam -- https://master.php.net/note/delete/88021/spam Del: non-english -- https://master.php.net/note/delete/88021/non-english Del: in docs -- https://master.php.net/note/delete/88021/in+docs Del: other reasons-- https://master.php.net/note/delete/88021 Reject -- https://master.php.net/note/reject/88021 Search -- https://master.php.net/manage/user-notes.php