a.php
<?php
session_start();
session_register('var');
$var = 'session ok!';
?>
<a href=b.php>next page</a>b.php
<?php
session_start();
if (session_is_registered('var')) {
echo $HTTP_SESSION_VARS['var'];
} else {
echo 'session fail!';
}
<?php
session_start();
session_register('var');
$var = 'session ok!';
?>
<a href=b.php>next page</a>b.php
<?php
session_start();
if (session_is_registered('var')) {
echo $HTTP_SESSION_VARS['var'];
} else {
echo 'session fail!';
}
session_register('font_family');
session_register('font_size');
} else if ((!$font_family) || (!$font_size)) {
session_register('font_family');
session_register('font_size');
} if (!$font_family) {
$font_family = "sans-serif";
}
if (!$font_size) {
$font_size = "10";
} ?>
session 可以看作是一个可以在不同页面之间共享的变量!