php cookie logout settings output and logout study notes

This is a study note from a friend when he was learning PHP. Its function is to set a cookie and then log out and output the cookie value.

The setcookie() function is used to set cookies.

Note: The setcookie() function must be placed before the 100db36a723c770d327fc0aef2ce13b1 tag.

Syntax

setcookie(name, value, expire, path, domain);

See examples below

<?php
//注销cookie
if(isset($_GET[&#39;out&#39;])){
setcookie(&#39;us&#39;,"");
echo "<script>location.href=&#39;index.php&#39;</script>"; 
}

//设置cookie
if(isset($_POST[&#39;sub&#39;])){
setcookie("us",$_POST[&#39;user&#39;],time()+3600);
echo "<script>location.href=&#39;index.php&#39;</script>";
}

//输出和注销cookie
if($_COOKIE[&#39;us&#39;]){
echo $_COOKIE[&#39;us&#39;];
echo "<a href=&#39;index.php?out=out&#39;>注销cookies</a>"; 
}

?>
<form method="post">
<input type="text" name="user">
<input type="password" name="pass">
<input type="submit" name="sub" value="提交">
</form>