Php user registration instance code, suitable for beginners _ PHP Tutorial

Php users register instance code, suitable for beginners. Php Tutorial user register instance code, suitable for beginners if ($ _ POST [submit]) {checkusername ($ _ POST [username]); if ($ _ SESSION [code] $ _ POST [code]) {$ usernamestr_replace (, $ _ POST [usern php Tutorial user register instance code, suitable for beginners
If ($ _ POST [submit]) {

Checkusername ($ _ POST [username]);

If ($ _ SESSION ["code"] === _ POST [code])

{

$ Username = str_replace ("", "", $ _ POST [username]);
$ Password = md5 ($ _ POST [password]. ALL_PS );
$ SQL = "INSERT INTO 'member '. 'user _ list' ('uid', 'M _ id', 'username', 'password') VALUES (NULL, '$ _ POST [select]', '$ username',' $ password ')";
Mysql tutorial _ query ($ SQL );
Echo "registration successful ";
}

Else
{
Echo "incorrect verification code "."
";
Session_destroy ();
}
}

Function checkusername ($ username)
{
$ Sql2 = "select uid from user_list where username = '". mysql_escape_string ($ username )."'";
$ Result = mysql_query ($ sql2) or die ('Error: '. mysql_error ());
If (mysql_num_rows ($ result)> 0)
{
Echo "this user name already exists. please change it! ";

Exit ();
}
Else {
Echo "script location. href = 'Reg. php' script";
}

}

?>

If ($ _ POST [submit]) {checkusername ($ _ POST [username]); if ($ _ SESSION [code] == _ POST [code]) {$ username = str_replace (, $ _ POST [usern...