php字符串加密函数

 比如：

$array = array( 

"a" => "1", 

"b" => "2", 

"c" => "3", 

"d" => "4" 

); 

//serialize产生一个可存储的值,返回一个字符串,unserialize还原 

$txt = serialize($array); 

$key = “testkey”; 

$encrypt = passport_encrypt($txt,$key); 

$decrypt = passport_decrypt($encrypt,$key); 

$decryptArray = unserialize($decrypt); 

echo $txt.””; 

echo $encrypt.””; 

echo $decrypt.””; 

echo $decryptArray.””;