PHP imagejpeg不工作

Question

因此，我看了几乎所有的问题，并尝试使用下面的php脚本显示我的图像。但它不起作用。我还尝试查看是否使用PHPInfo()启用了GD库，并且它也工作得很好。我是PHP的新手，但似乎不能让它工作。谢谢你的帮忙!

编辑:点击upload a doc按钮后，我得到一个损坏的图像图标。

<?php
 if($_SERVER['REQUEST_METHOD'] == 'POST') {
if(isset($_FILES['photo'])
        && is_uploaded_file($_FILES['photo']['tmp_name'])
        && $_FILES['photo']['error'] == UPLOAD_ERR_OK) {
            foreach ($_FILES['photo'] as $key => $value) {
                echo "$key : $value<br />";
            }
            if($_FILES['photo']['type'] == 'image/jpeg') {
                $tmp_img = $_FILES['photo']['tmp_name'];
                $image = imagecreatefromjpeg($tmp_img);
                header('Content-Type: image/jpeg');
                imagejpeg($image,NULL);
                imagedestroy($image);
            } else {
                echo "Uploaded file ewas not a jpg image.";
            }
                echo "no photo uploaded.";
              }
}
?>
<form enctype="multipart/form-data" action="book.php" method="post">
<input type="file" name="photo">
<input type="submit" value="upload a doc">
</form>

Answer 1

您可以尝试在imagedestroy($image);之后添加die();，以阻止除图像数据以外的任何其他输出。还要将imagejpeg($image,NULL);更改为imagejpeg($image);。

Answer 2

您不能使用tmp_name直接访问镜像。首先，您应该将图像保存到服务器，然后您可以使用imagecreatefromjpeg

<?php
if($_SERVER['REQUEST_METHOD'] == 'POST') {
if(isset($_FILES['photo'])
        && is_uploaded_file($_FILES['photo']['tmp_name'])
        && $_FILES['photo']['error'] == UPLOAD_ERR_OK) {
            if($_FILES['photo']['type'] == 'image/jpeg') {
                $tmp_img = $_FILES['photo']['tmp_name'];
                $uniq_name = uniqid().".".explode(".",$tmp_img)[1];
                move_uploaded_file($_FILES['photo']['tmp_name'],$uniq_name);
                $image = imagecreatefromjpeg($uniq_name);
                header('Content-Type: image/jpeg');
                imagejpeg($image);
                imagedestroy($image);
            } else {
                echo "Uploaded file ewas not a jpg image.";
            }
                echo "no photo uploaded.";
              }
}
?>
<form enctype="multipart/form-data" action="book.php" method="post">
<input type="file" name="photo">
<input type="submit" value="upload a doc">
</form>

Answer 3

我认为问题出在echo和PHP节(HTML代码)之后的输出字符串上。删除foreach循环并仅在是新页面或出现错误时输出HTML.

<?php
  if($_SERVER['REQUEST_METHOD'] == 'POST') {
    if(isset($_FILES['photo'])
        && is_uploaded_file($_FILES['photo']['tmp_name'])
        && $_FILES['photo']['error'] == UPLOAD_ERR_OK) {
            if($_FILES['photo']['type'] == 'image/jpeg') {
                $tmp_img = $_FILES['photo']['tmp_name'];
                $image = imagecreatefromjpeg($tmp_img);
                header('Content-Type: image/jpeg');
                imagejpeg($image,NULL);
                imagedestroy($image);
                exit; // Add this to stop the program here.
            } else {
                echo "Uploaded file was not a jpg image.";
            }
    } else {
      echo 'No file was sent.';
    }
}
?>
<form enctype="multipart/form-data" action="book.php" method="post">
<input type="file" name="photo">
<input type="submit" value="upload a doc">
</form>

还有一件事，如果您使用记事本编写代码，请确保文件开头没有隐藏字符。