05c01-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 25 行

<?php
// A function that returns a value one greater than the GET variable 'count'
function increment_count() {
    if (isset($_GET['count'])) {
        return $_GET['count'] + 1;
    } else {
        return 1;
    }
}

// Save the value of the GET variable 'count', otherwise default to 0
$counter = 0;
if (isset($_GET['count'])) {
    $counter = $_GET['count'];
}

// Prepare a statement about the number of clicks:
echo "<p>You have clicked on this page {$counter} times.</p>\n";

// Now offer to let them click again, using PHP_SELF to automatically link
//  back to this script, and incrementing the count:
echo '<p>Do you want to <a href="', $_SERVER['PHP_SELF'], '?count=', 
        increment_count(), '">click again</a>?</p>';
?>