裁剪图像大小后的正方形

Question

大家好，

在我调整大小后，如何裁剪从中心上传的200x200大小的图像？ 此时，我按比例调整为200px。

看看调整大小的评论。

我的PHP脚本：

<?
    if (isset($_POST['avatar-form'])) {
        $image_uploaded = $_FILES['avatar'];
        // get name - type - ext
        if (is_uploaded_file($image_uploaded['tmp_name'])) {
            $valid_ext = array('jpg', 'jpeg', 'png');
            $valid_type = array('image/jpg', 'image/jpeg', 'image/png');
            $image_uploadedName = basename($image_uploaded['name']);
            $ext = strtolower(explode('.', $image_uploadedName)[1]);
            $name = strtolower(explode('.', $image_uploadedName)[0]);
            // valid ext
            if (in_array($ext, $valid_ext)) {
                if (in_array($image_uploaded['type'], $valid_type)) {
                    if (in_array('image/jpg', $valid_type) || in_array('image/jpeg', $valid_type)) {
                        $image = imagecreatefromjpeg($image_uploaded['tmp_name']);
                    }
                    else if (in_array('image/png', $valid_type)) {
                        $image = imagecreatefrompng($image_uploaded['tmp_name']);
                    }
                    // resizing
                    $imgSize = getimagesize($image_uploaded['tmp_name']);
                    $resizeSizeImg = 200;
                    if ($imgSize[0] > $imgSize[1]) {
                        $thumbnailWidth = $resizeSizeImg;
                        $thumbnailHeight = round($imgSize[1] / $imgSize[0] * $resizeSizeImg);
                    } else {
                        $thumbnailWidth = round($imgSize[0] / $imgSize[1] * $resizeSizeImg);
                        $thumbnailHeight = $resizeSizeImg;
                    }
                    // create img
                    $thumbnail = imagecreatetruecolor($thumbnailWidth, $thumbnailHeight);
                    imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $thumbnailWidth, $thumbnailHeight, $imgSize[0],$imgSize[1]);
                    if (in_array('image/jpg', $valid_type) || in_array('image/jpeg', $valid_type)) {
                        imagejpeg($thumbnail, 'public/img/upload/avatar/'.$name.'.'.$ext);
                    } 
                     else if (in_array('image/png', $valid_type)) {
                        imagepng($thumbnail, 'public/img/upload/avatar'.$name.'.'.$ext);
                    }
                } else {
                    echo '<p class="uk-text-danger">Not an image.</p>';
                }
            } else {
                echo '<p class="uk-text-danger">Not an image.</p>';
            }
        }
    }
?>

非常感谢您！