Simulate C's data structure with PHP

C is convenient for storing with a fixed data structure.
struct USERINFO
{
int ID;
Char username[10];
Char password[15];
Char mail[10];
}typedef USERINFO;
USERINFO USERINFO;
ZeroMemory (&userinfo,sizeof (UserInfo));
Userinfo.id = 1;
strcat (Userinfo.username, "Wan_dou");
strcat (Userinfo.password, "PASSWORD");
strcat (Userinfo.mail, "wan_dou@citiz.net");
FILE *FP = fopen ("C:/x.txt", "w");
Fwrite (&userinfo,sizeof (UserInfo), 1,FP);
Fclose (FP);
A user's information will be saved. If a variable or array input is less than the input to him automatically fill empty, so it is easier to remove
Fread (&userinfo,sizeof (UserInfo), 1,FP);
But PHP seems to have no struct support, and class with the same operation must be wrong.
So you only have to simulate a structure yourself.
Below is a less mature structure, the most annoying is not to support the variable length of data.

?
Define ("Userinfopath", "Data/userinfo");

Class USERINFO
{
var $UserInfoStruct = Array
(
"UserName" => 10,//Definition structure
"PassWord" => 15,//if int, float,double can refer to the definition in the database or set itself
"Mail" => 50,//50: Length of character required, mail is structure name
);
var $UserName//The variable that really holds the content is here.
var $PassWord;//
var $Mail//, must be the same as the description of the structure definition.

function CheckValue ($STR, $n)//Given a variable, and the specified variable length variable
{
while (strlen ($STR) < $n)//Less fill
{
$str. = ';
}
if (strlen ($STR) > $n)/Rewind
$str = substr ($str, 0, $n);

}
function SaveToFile ($filename)//Save as a file
{
$fp = fopen ($filename, "w");/Open
for (Reset ($this->userinfostruct); $i =key ($this->userinfostruct); next ($this->userinfostruct))
{
$this->checkvalue (& $this-> $i, $this->userinfostruct[$i]);//Call function, check variable provide pointer address
echo $this-> $i;//I put my own debugging, can be deleted.
Fputs ($fp, $this-> $i, $this->userinfostruct[$i])//write $this-> $i is a variable that refers to a phase variable, such as $this->username, and the third parameter can be province, But if you add a more reliable variable that holds the specified length.;

}
Fclose ($FP);//Close
}
function LoadFromFile ($filename)//read from a file
{
$fp = fopen ($filename, "R");/Open
for (Reset ($this->userinfostruct); $i =key ($this->userinfostruct); next ($this->userinfostruct))
{
$this-> $i = fgets ($fp, $this->userinfostruct[$i])//read out characters of the specified length to the variable
echo $this-> $i;//debug yourself
}
Fclose ($FP);//Close
}

};
/*
$UserInfo = new userinfo;//Write
$UserInfo-> UserName = "Wan_dou";
$UserInfo-> PassWord = "1981627";
$UserInfo-> Mail = "wan_dou@sina.com.cn";
$UserInfo-> savetofile ("C:/1.txt");

$UserInfoLoad = new userinfo;//Read
$UserInfoLoad->loadfromfile ("C:/1.txt");
Echo $UserInfoLoad->username;
*/
?>