Introduction to the use of PHP encryption functions md5, crypt, base64_encode, etc._PHP Tutorial

The irreversible encryption functions are: md5(), crypt()
md5() is used to calculate MD5 hash. The syntax is: string md5(string str);
crypt() Encrypt the string using UNIX's standard encryption DES module. This is a one-way encryption function and cannot be decrypted. To compare strings, place the first two characters of the encrypted string in the salt parameter, and then compare the encrypted strings. The syntax is: string crypt(string str, string [salt]);
Reversible encryption is: base64_encode(), urlencode(). The corresponding decryption function: base64_decode(), urldecode()

base64_encode() MIME BASE64 encodes a string. This encoding method allows Chinese text or pictures to be transmitted smoothly over the Internet. The syntax is string base64_encode(string data); Its decryption function is: string base64_decode(string encoded_data); It will return to its original state
urlencode() URL-encodes the string. For example, spaces will become plus signs. The syntax is: string urlencode(string str);
Its decryption function is: string urldecode(string str); It will return to the original state

Look at the code: