Php-simple symmetric encryption algorithm and conversion functions between strings and hexadecimal notation

: This article mainly introduces the php-simple symmetric encryption algorithm and the conversion function between the string and the hexadecimal system. if you are interested in the PHP Tutorial, refer to it. /**
* Encryption of simple symmetric encryption algorithms
* @ Param String $ string the String to be encrypted
* @ Param String $ skey encrypt EKY
* @ Return String
*/
Function encode ($ string = '', $ skey = 'textphp '){
$ Skey = str_split (base64_encode ($ skey ));
$ StrArr = str_split (base64_encode ($ string ));
$ StrCount = count ($ strArr );
Foreach ($ skey as $ key => $ value ){
$ Key <$ strCount & $ strArr [$ key]. = $ value;
}
Return str_replace ('=', '0o0o', join ('', $ strArr ));
}

/**
* Decryption of simple symmetric encryption algorithms
* @ Param String $ string the String to be decrypted
* @ Param String $ skey decryption KEY
* @ Return String
*/
Function decode ($ string = '', $ skey = 'textphp '){
$ Skey = str_split (base64_encode ($ skey ));
$ StrArr = str_split (str_replace ('0o0o', '=', $ string), 2 );
$ StrCount = count ($ strArr );
Foreach ($ skey as $ key => $ value ){
$ Key <$ strCount & $ strArr [$ key] [1] ===$ value & $ strArr [$ key] = $ strArr [$ key] [0];
}
Return base64_decode (join ('', $ strArr ));
}

// Convert string to hexadecimal
Function str2hex ($ str, $ encoded = 'gbk '){
$ Hex = '';
If ($ encoded = 'gbk '){
$ Str = mb_convert_encoding ($ str, 'gbk', 'utf-8 ');
}
For ($ I = 0, $ length = mb_strlen ($ str); $ I <$ length; $ I ++ ){
$ Hex. = dechex (ord ($ str {$ I }));
}
Return $ hex;
}

// Convert the string in hexadecimal notation
Function hex2str ($ hex, $ encoded = 'gbk '){
$ Str = '';
$ Arr = str_split ($ hex, 2 );
Foreach ($ arr as $ bit ){
$ Str. = chr (hexdec ($ bit ));
}
If ($ encoded = 'gbk '){
$ Str = mb_convert_encoding ($ str, 'utf-8', 'gbk ');
}
Return $ str;
}

The above introduces the php-simple symmetric encryption algorithm and the conversion function between strings and the hexadecimal system, including some content, and hope to be helpful to those who are interested in the PHP Tutorial.