在 PHP 中创建方形 1:1 缩略图

Question

如何设置此代码以 1：1（正方形）返回图像？

目的是创建一个正方形（非拉伸）缩略图。

我尝试在"if"部分进行更改。我得到一个方形图像，但被拉伸了。我希望它被裁剪。

define('THUMBNAIL_IMAGE_MAX_WIDTH', 150);
define('THUMBNAIL_IMAGE_MAX_HEIGHT', 150);
$source_image_path = {here the source filename};
$thumbnail_image_path = {here de thumb filename};
list($source_image_width, $source_image_height, $source_image_type) = getimagesize($source_image_path);
switch ($source_image_type) {
    case IMAGETYPE_GIF:
    $source_gd_image = imagecreatefromgif($source_image_path);
    break;
    case IMAGETYPE_JPEG:
    $source_gd_image = imagecreatefromjpeg($source_image_path);
    break;
    case IMAGETYPE_PNG:
    $source_gd_image = imagecreatefrompng($source_image_path);
    break;
}
$source_aspect_ratio = $source_image_width / $source_image_height;
$thumbnail_aspect_ratio = THUMBNAIL_IMAGE_MAX_WIDTH / THUMBNAIL_IMAGE_MAX_HEIGHT;
if ($source_image_width <= THUMBNAIL_IMAGE_MAX_WIDTH && $source_image_height <= THUMBNAIL_IMAGE_MAX_HEIGHT) {
    $thumbnail_image_width = $source_image_width;
    $thumbnail_image_height = $source_image_height;
} elseif ($thumbnail_aspect_ratio > $source_aspect_ratio) {
    $thumbnail_image_width = (int) (THUMBNAIL_IMAGE_MAX_HEIGHT * $source_aspect_ratio);
    $thumbnail_image_height = THUMBNAIL_IMAGE_MAX_HEIGHT;
} else {
    $thumbnail_image_width = THUMBNAIL_IMAGE_MAX_WIDTH;
    $thumbnail_image_height = (int) (THUMBNAIL_IMAGE_MAX_WIDTH / $source_aspect_ratio);
}
$thumbnail_gd_image = imagecreatetruecolor($thumbnail_image_width, $thumbnail_image_height);
imagecopyresampled($thumbnail_gd_image, $source_gd_image, 0, 0, 0, 0, $thumbnail_image_width, $thumbnail_image_height, $source_image_width, $source_image_height);
imagejpeg($thumbnail_gd_image, $thumbnail_image_path, 90);

附言。这不是重复的，我已经阅读了这个主题的几个问题，但我无法通过我的代码集成它。

Answer 1

这个函数做了这个技巧

function crop_img($imgSrc){
    //getting the image dimensions
    list($width, $height) = getimagesize($imgSrc);
    //saving the image into memory (for manipulation with GD Library)
    $myImage = imagecreatefromjpeg($imgSrc);
    // calculating the part of the image to use for thumbnail
    if ($width > $height) {
        $y = 0;
        $x = ($width - $height) / 2;
        $smallestSide = $height;
    } else {
        $x = 0;
        $y = ($height - $width) / 2;
        $smallestSide = $width;
    }
    // copying the part into thumbnail
    $thumbSize = min($width,$height);
    $thumb = imagecreatetruecolor($thumbSize, $thumbSize);
    imagecopyresampled($thumb, $myImage, 0, 0, $x, $y, $thumbSize, $thumbSize, $smallestSide, $smallestSide);
    unlink($imgSrc);
    imagejpeg($thumb,$imgSrc);
    @imagedestroy($myImage);
    @imagedestroy($thumb);
}

发现于： PHP 裁剪图像以固定宽度和高度而不会丢失尺寸比

Answer 2

使用此代码 此代码将图像上传到文件夹并重命名文件，并将使用相同的名称创建拇指

.HTML

<INPUT NAME="userfile[]" TYPE="file">

映像目录"upimg/"
拇指目录thimg

PHP处理

$rename = md5(rand() * time());
        $add = "upimg/" . $rename . $_FILES['userfile']['name'];
        if (move_uploaded_file($_FILES['userfile']['tmp_name'], $add)) {
            echo "Successfully uploaded the image";
            chmod("$add", 0777);
        } else {
            exit;
        }
        $n_width = 200;
        $n_height = 200;
        $tsrc = "thimg/" . $rename . $_FILES['userfile']['name'];
        if (!($_FILES['userfile']['type'] == "image/jpeg" OR $_FILES['userfile']['type'] == "image/gif")) {
            exit;
        }
        if ($_FILES['userfile']['type'] == "image/gif") {
            $im = ImageCreateFromGIF($add);
            $width = ImageSx($im);
            $height = ImageSy($im);
            $newimage = imagecreatetruecolor($n_width, $n_height);
            imageCopyResized($newimage, $im, 0, 0, 0, 0, $n_width, $n_height, $width, $height);
            if (function_exists("imagegif")) {
                Header("Content-type: image/gif");
                ImageGIF($newimage, $tsrc);
            } elseif (function_exists("imagejpeg")) {
                Header("Content-type: image/jpeg");
                ImageJPEG($newimage, $tsrc);
            }
            chmod("$tsrc", 0777);
        }
        if ($_FILES['userfile']['type'] == "image/jpeg") {
            $im = ImageCreateFromJPEG($add);
            $width = ImageSx($im);
            $height = ImageSy($im);
            $newimage = imagecreatetruecolor($n_width, $n_height);
            imageCopyResized($newimage, $im, 0, 0, 0, 0, $n_width, $n_height, $width, $height);
            ImageJpeg($newimage, $tsrc);
            chmod("$tsrc", 0777);
        }