Why is my COOKIE unusable like this? Is PHP required to be written in this way?

Why is my COOKIE unusable like this? Is PHP required to be written in this way? This is a piece of code written in the book two days ago. I wrote comments myself. php page login, unable to get the cookie, but I am in login. echo $ _ POST [& quot; username & quot;] can be used at the beginning of the php page to obtain the value passed from the form, I don't know. it's my cookiemanager. Why is my COOKIE so unusable? Is PHP required to be written in this way?
This is a piece of code written in the book two days ago. I wrote comments myself. php page login, unable to get the cookie, but I am in login. echo $ _ POST ["username"] can be used at the beginning of the php page to obtain the value passed from the form. I don't know if my cookiemanager class is wrong, or what went wrong?


Newbie, I am not quite familiar with the usage of user-defined functions. I will ask you to write the main code as a separate page in PHP and then load it for use? The problem may be a bit small, but this is an important step to be familiar with PHP ··

PHP code

  
  $ Value) {setcookie ($ key, $ value) ;}} public function Set_Cookie ($ key, $ value) {// Set setcookie ($ key, $ value );} public function Get_Array_Cookie () {return $ _ COOKIE;} public function up_Cookie ($ key, $ value) {setcookie ($ key, "", $ time );}} global $ cm; if (! Isset ($ cm) {$ cm = new CookieManager (); // determines whether the $ cm variable exists. if it does not exist, it is instantiated.}?>

PHP code

  
  Get_CookieV ("username") {echo <
    
   Username:    
   
Password:          
  
   
              
  
   
 
EOT;} else {print_r ($ cm-> Get_Array_Cookie (); echo'
   
Exit ';} ob_flush ();?>
  

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PHP code

  $ Value) {setcookie ($ key, $ value) ;}} public function Set_Cookie ($ key, $ value) {// Set setcookie ($ key, $ value );} public function Get_Array_Cookie () {return $ _ COOKIE;} public function up_Cookie ($ key, $ value) {setcookie ($ key, "", $ time) ;}?>