php 的加密函数 md,crypt,base_encode 等使用介绍.docVIP

php 的加密函数 md5,crypt,base64_encode 等使用介绍（） PHP in registration, login or URL transfer parameters will use the character variable encryption, below we will simply introduce: PHP own encryption function The irreversible encryption functions are: MD5 (), crypt () MD5 () is used to calculate MD5. The syntax is: String MD5 (string str); Crypt () encrypts the string with the standard encryption DES module of UNIX. This is a one-way encryption function that cannot be decrypted. To compare the string, put the first two characters of the encrypted string in the salt parameter, and then compare the encrypted string. The syntax is: String crypt (string STR, string [salt]); Reversible encryption: base64_encode (), URLEncode () corresponding decryption function: base64_decode (), URLDecode () Base64_encode () encodes the string in MIME BASE64. This encoding allows the Chinese text or picture to be transmitted over the network. The syntax is string base64_encode (string data); its decryption function is: string base64_decode (string encoded_data); it will be returned to the original state URLEncode () encodes the string in URL. For example, whitespace becomes a plus. The syntax is: string URLEncode (string str); Its decryption function is: string URLDecode (string STR); will be returned to the original See paragraph code: Code is as follows: PHP? Define (STR, ink sword); The result of echomd5 encryption is:.md5 (STR).br; //md5 encryption Echocrypt encrypted data:.crypt (STR, STR).br/ crypt encryption; $base64encode=base64_encode (STR); / / base64_encode (encryption) The result of echobase64_encode encryption is:.$base64encode.br; After echobase64_decode decryption, the result is:.base64_decode ($base64encode).br; //base64_decode () decrypt $urlencode=urlencode (STR); //urlencode () encryption The result of echourlencode encryption is:.$urlencode.br; The result of echourldecode decryption is:.urldecode ($urlencode).br; //urldecode () decryption ? The result of the output is: The r