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如何在上传之前或期间调整图片大小？

    <?php
     // Start a session for error reporting
    session_start();
    ?>
     <?php
    // Check, if username session is NOT set then this page will jump to login page
if (!isset($_SESSION['username'])) {
        header('Location: index.html');
        exit;
}
// *** Include the class
    include("resize-class.php");


// Call our connection file
include('config.php');

// Check to see if the type of file uploaded is a valid image type
function is_valid_type($file)
{
    // This is an array that holds all the valid image MIME types
    $valid_types = …