如何动态设置if和elseif条件？ [关闭]

Generally what I used to do was this

if($_GET['page'] == 'hello') { //This page is always there
   echo 'hello';
} elseif($_GET['page'] == 'world') {
   echo 'world';
} elseif($_GET['page'] == 'demo') {
   echo 'demo';
}

But now am getting these page names from my database dynamically so how do I set something like this if am retrieving the names dynamically? So how I can make something like this when I retrieve page names as

demo1, demo2, demo3?

Something like this?

if ($_GET['page'] == 'hello') {
    echo 'hello';
} else {
    $pagesFromDatabase = array();
    foreach ($pagesFromDatabase as $page) {
        if ($page['slug'] == $_GET['page']) {
            // do something with page
        }
    }
}

This works assuming $pagesFromDatabase is an associative array with each row containing the key 'slug' referring to the possible 'page' parameter in $_GET.

If you're referring to Wordpress, you can retrieve a page like so:

get_page_by_path($_GET['page']);

http://codex.wordpress.org/Function_Reference/get_page_by_path

You can use something like:

$page = array('hello');
#database loop
$page[] = $row[your_page_row];
#end database loop

if(in_array($_GET['page'], $page){#for strict comparison in_array($_GET['page'], $page, true);
    echo $_GET['page'];#you might need to use something like htmlspecialchars();
}