Question

我有这个PHP脚本（如下）：我使用POST获取base64字符串，而不是使用imagecreatefromstring函数，然后尝试添加水印并保存它。但上传后该文件在服务器上为空。我做错了什么？

    <?php
    if($_SERVER['REQUEST_METHOD'] == "POST") {
    define('UPLOAD_DIR', 'img/');

    $base64 = base64_decode(preg_replace('#^data:image/[^;]+;base64,#', '', $_POST['string']));

    $stamp = imagecreatefrompng('img/wm.png');
    $im = imagecreatefromstring($base64);


    $marge_right = 10;
    $marge_bottom = 10;
    $sx = imagesx($stamp);
    $sy = imagesy($stamp);

    imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 50);


    $file = UPLOAD_DIR . uniqid() . '.png';

    imagepng($im, $file, 100);


    echo 'ok';
    } else {
    echo "error";
    }


?>

有人可以帮我解决这个问题吗？

Answer 1

之前添加此代码，以检查您的图片是否已创建

$im = imagecreatefromstring($base64);
if ($im !== false) {
    header('Content-Type: image/png');
    $marge_right = 10;
    $marge_bottom = 10;
    $sx = imagesx($stamp);
    $sy = imagesy($stamp);

    imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 50);


    $file = UPLOAD_DIR . uniqid() . '.png';

    imagepng($im, $file, 100);
    imagedestroy($im);
}
else {
    echo 'An error occurred.';
}

//

添加水印到图像（Base64）并转换它

1 个答案: