06c04-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 20 行

<?php
// If input came via _POST then it was a form submission, trim the 
//  data and return it:
if (count($_POST) > 0) {
    $prepped = create_function('$a', 'return trim($_POST[$a]);');
}
// If this is a GET, then assume these are configuration parameters,
//  and that we need to not trim, but ensure they are upper case:
elseif (count($_GET) > 0) {
    $prepped = create_function('$a', 'return strtoupper($_GET[$a]);');
}
// Else, we had no input, create a function that just always returns false.
else {
    $prepped = create_function('$a', 'return false;');
}

// Now call this function to retrieve a certain value:
echo $prepped('file');
?>