09c05-1.php

介绍PHP5的给类型函数应用

<?php
// First of all, handle configuration ... Read in values from a GET
//  and default values that don't exist:
$page = (isset($_GET['page']) && ($_GET['page'] > 0)) 
    ? intval($_GET['page']) : 1;
$view = (isset($_GET['view']) && ($_GET['view'] > 0)) 
    ? intval($_GET['view']) : 10;

// Create our fake data to paginate on, just use the alphabet
$data = range('a', 'z');

// Now, chunk the data into equal sized pieces, based upon the view.
$pages = array_chunk($data, $view, true);

// Now output the chunk of data that was asked for:
echo "<p>The results are:</p>\n<p>\n";
foreach($pages[$page - 1] as $num => $datum) {
    echo $num + 1, ". {$datum}<br />\n";
}
echo "</p>\n";

// Now create the options to change what page you are viewing:
echo '<p>Switch to page: |';
$get = $_GET;
foreach(range(1, count($pages)) as $p) {
    // If this is the current page:
    if ($page == $p) {
        echo " {$p} |";
    } else {
        // We need to give them their option - First generate the URL needed
        // We want to duplicate any query string given to us, but replacing
        //  any pagination values with our new page.  Easiest is to take a
        //  current copy of get, update it for our values, then recreate it.
        $get['page'] = $p;
        $query = http_build_query($get);
        echo " <a href=\"{$_SERVER['PHP_SELF']}?{$query}\">{$p}</a> |";
    }
}
echo "</p>\n";

// Now let's give some options to change how many results we see per page:
$options = array(3, 5, 10, 50);

// Make a new copy of the $_GET array to play with again
$get = $_GET;

// Always set page to 1 when making a change to the number of results:
unset($get['page']);

// And let's output the options in the same manner as the pages:
echo '<p>Results per page: |';
foreach($options as $o) {
    // If the current option:
    if ($o == $view) {
        echo " {$o} |";
    } else {
        // Give the new option, again by regenerating the GET
        $get['view'] = $o;
        $query = http_build_query($get);
        echo " <a href=\"{$_SERVER['PHP_SELF']}?{$query}\">{$o}</a> |";
    }
}
echo "</p>\n";
?>