PHP session control example analysis

This article mainly introduces PHP session control, and analyzes PHP's related operating techniques for cookies and sessions in the form of examples. Friends in need can refer to it

The details are as follows:

About Test code for cookie and session:

<?php
session_start();
define(&#39;u&#39;,&#39;a&#39;);
define(&#39;p&#39;,&#39;1&#39;);
if (isset($_GET[&#39;r&#39;]) && $_GET[&#39;r&#39;]== 1) {
  unset($_COOKIE[&#39;username&#39;]);
  unset($_COOKIE[&#39;password&#39;]);
  unset($_SESSION[&#39;valid_login&#39;]);
}
if (isset($_POST[&#39;username&#39;]) && isset($_POST[&#39;password&#39;])) {
  $username = $_POST[&#39;username&#39;];
  $password = $_POST[&#39;password&#39;];
  if ($username == u && $password == p) {
    $_SESSION[&#39;valid_login&#39;] = 1;
    setcookie(&#39;username&#39;, $username);
    setcookie(&#39;password&#39;, $password);
  } else {
    echo &#39;incorrect u or p&#39;;
  }
}
?>
<?php
if (isset($_SESSION[&#39;valid_login&#39;])) {
  printf(&#39;welcom, %s&#39;, $_COOKIE[&#39;username&#39;]);
} else {
?>
<form action="" method="post">
  <input type="text" name="username" value="" />
  <input type="password" name="password" value="" />
  <input type="submit" />
</form>
<?php
}
?>
<br />
<a href="cookie_session.php" title="">refresh</a>
<br />
<a href="cookie_session.php?r=1" title="">clear</a>

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