PHP encryption and decryption string functions_PHP tutorial

Sometimes we don’t want people to see a web page address. The simple way is to encrypt it into a string of characters. The function is as follows:

function encrypt($key, $plain_text) {
$plain_text = trim($plain_text);
$iv = substr(md5($key), 0,mcrypt_get_iv_size(MCRYPT_CAST_256,MCRYPT_MODE_CFB));
$c_t = mcrypt_cfb (MCRYPT_CAST_256, $key, $plain_text, MCRYPT_ENCRYPT, $iv);
return trim(chop(base64_encode($c_t)));
}

$key can be set to a string, and $plain_text is the string you want to encrypt. The corresponding decryption function:

function decrypt($key, $c_t) {
$c_t = trim(chop(base64_decode($c_t)));
$iv = substr(md5($key), 0,mcrypt_get_iv_size (MCRYPT_CAST_256 ,MCRYPT_MODE_CFB));
$p_t = mcrypt_cfb (MCRYPT_CAST_256, $key, $c_t, MCRYPT_DECRYPT, $iv);
return trim(chop($p_t));
}

$plain_text is the string you want to decrypt;

Note: If you use a URL to pass an encrypted string as a parameter, you must use the URLEncode() function to encrypt it. Otherwise, the parameters obtained by decrypting with the decrypt($key, $c_t) function will not get the original characters. string.

http://www.bkjia.com/PHPjc/364698.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/364698.htmlTechArticleSometimes we don’t want people to see a web address. The simple way is to encrypt it into a string of characters , the function is as follows: function encrypt($key, $plain_text) { $plain_text = t...