Javascript 带有水印和调整大小的php图像上载

我有下面的代码将图片上传到我的网站，但是上传的图片看起来很大，需要时间在网站上加载，我想让它们变小，并且我想从我自己的网站上添加水印

我希望图像能像1080X1080那样显示，但质量很好，我试图缩小有限的上传大小，但有些用户不知道如何调整照片的大小

$total=count（$_文件['document']['name']）；
如果（$total>0）{
$total=计数（$_文件['document']['name']）；
如果（$total，则需要使用PHP或函数来处理图像

以GD为例，它简单到

function resize_image($file, $w, $h, $crop=FALSE) {
    list($width, $height) = getimagesize($file);
    $r = $width / $height;
    if ($crop) {
        if ($width > $height) {
            $width = ceil($width-($width*abs($r-$w/$h)));
        } else {
            $height = ceil($height-($height*abs($r-$w/$h)));
        }
        $newwidth = $w;
        $newheight = $h;
    } else {
        if ($w/$h > $r) {
            $newwidth = $h*$r;
            $newheight = $h;
        } else {
            $newheight = $w/$r;
            $newwidth = $w;
        }
    }
    $src = imagecreatefromjpeg($file);
    $dst = imagecreatetruecolor($newwidth, $newheight);
    imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

    return $dst;
}

你可以调用这个函数，就像这样

$img = resize_image(‘/path/to/some/image.jpg’, 200, 200);

从个人经验来看，GD的图像重采样也大大减少了文件大小，尤其是在对原始数码相机图像进行重采样时

和水印

PHP手册中的A：

// Load the stamp and the photo to apply the watermark to
$stamp = imagecreatefrompng('stamp.png');
$im = imagecreatefromjpeg('photo.jpeg');

// Set the margins for the stamp and get the height/width of the stamp image
$marge_right = 10;
$marge_bottom = 10;
$sx = imagesx($stamp);
$sy = imagesy($stamp);

// Copy the stamp image onto our photo using the margin offsets and the photo 
// width to calculate positioning of the stamp. 
imagecopy($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp));

// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);

您需要使用PHP或函数来处理图像

以GD为例，它简单到

function resize_image($file, $w, $h, $crop=FALSE) {
    list($width, $height) = getimagesize($file);
    $r = $width / $height;
    if ($crop) {
        if ($width > $height) {
            $width = ceil($width-($width*abs($r-$w/$h)));
        } else {
            $height = ceil($height-($height*abs($r-$w/$h)));
        }
        $newwidth = $w;
        $newheight = $h;
    } else {
        if ($w/$h > $r) {
            $newwidth = $h*$r;
            $newheight = $h;
        } else {
            $newheight = $w/$r;
            $newwidth = $w;
        }
    }
    $src = imagecreatefromjpeg($file);
    $dst = imagecreatetruecolor($newwidth, $newheight);
    imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

    return $dst;
}

你可以调用这个函数，就像这样

$img = resize_image(‘/path/to/some/image.jpg’, 200, 200);

从个人经验来看，GD的图像重采样也大大减少了文件大小，尤其是在对原始数码相机图像进行重采样时

和水印

PHP手册中的A：

// Load the stamp and the photo to apply the watermark to
$stamp = imagecreatefrompng('stamp.png');
$im = imagecreatefromjpeg('photo.jpeg');

// Set the margins for the stamp and get the height/width of the stamp image
$marge_right = 10;
$marge_bottom = 10;
$sx = imagesx($stamp);
$sy = imagesy($stamp);

// Copy the stamp image onto our photo using the margin offsets and the photo 
// width to calculate positioning of the stamp. 
imagecopy($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp));

// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);

我能把它实现到我的代码中吗？我试过了，它给了我错误！！@Ronak Dhootar你使用GD或Imagick方法了吗？你得到了什么错误？我能把它实现到我的代码中吗？我试过了，它给了我错误！！@Ronak Dhootar你使用GD或Imagick方法了吗？这回答了你的问题吗？这回答了你吗你的问题？