About the HTML login interface.

About the HTML login interface .. Help !!! I am working on a small website. I need to log on to the website to perform subsequent operations! For example, I have three pages,. php, B. php, c. php. page a is used for login. only after Page a is successfully logged on Can Page B or c be entered! If you want to skip a and access B, the page is automatically forwarded to! How can I design this! Help !! About the HTML login interface .. Help !!!
I am working on a small website. I need to log on to the website to perform subsequent operations! For example, I have three pages,. php, B. php, c. php. page a is used for login. only after Page a is successfully logged on Can Page B or c be entered! If you want to skip a and access B, the page is automatically forwarded to!
How can I design this! Help !!!!!

------ Solution --------------------
I am a newbie in a relatively simple way and can have some restrictions, but these two may have problems. it is best to wait for other veterans,
Give a relatively complete method

If the post method is used
If ($ _ SERVER ['request _ method'] = 'post') {your page}
Else {
Echo" ";
}


If ($ name = ""){
Echo "you are not logged on and cannot access this page ";
Echo"
";
Echo "redirecting to the logon page ";
Echo" ";
}
Else {page to be displayed}

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You can use session. when the user completes all login operations and the user name and password entered are correct, $ _ SESSION ['status'] = 1, in this way, you can. check whether $ _ SESSION ['status'] exists or is assigned a value at the beginning of the php page. if the check is normal, you can browse the page. Otherwise, the page automatically jumps to. php page.