如何将图像文件大小转换为较小的尺寸

我想知道在上传时使我的 3MB 照片变小的最佳方法是什么 我有这个上传表格，但由于某种原因它不会上传超过 2MB 的图像，我总是得到"文件太小或太大"仅限 PHP

$valid_exts = array('jpeg', 'jpg', 'png', 'gif');
$max_file_size = 2000000 * 1234567; 
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if ( isset($_FILES['image']) ) {
        if (! $_FILES['image']['error'] && $_FILES['image']['size'] < $max_file_size) {
            $ext = strtolower(pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION));
            if (in_array($ext, $valid_exts)) {
                    if (!file_exists('photos/' )) {
                        mkdir('photos/' , 0777, true);
                        }
                    $path = 'photos/' . uniqid() . '.' . $ext;
                    $size = getimagesize($_FILES['image']['tmp_name']);

                    $x = (int) $_POST['x'];
                    $y = (int) $_POST['y'];
                    $w = (int) $_POST['w'] ? $_POST['w'] : $size[0];
                    $h = (int) $_POST['h'] ? $_POST['h'] : $size[1];
                    $data = file_get_contents($_FILES['image']['tmp_name']);
                    $vImg = imagecreatefromstring($data);
                    $dstImg = imagecreatetruecolor($w, $h);
                    imagecopyresampled($dstImg, $vImg, 0, 0, $x, $y, $w, $h, $w, $h);
                    imagejpeg($dstImg, $path);
                    imagedestroy($dstImg);
                    /*print_r($path);*/

                } else {
                    echo 'unknown problem!';
                } 
        } else {
            echo 'file is too small or large';
        }
    } else {
        echo 'file not set';
    }
} else {
    echo 'bad request!';
}