我使用这个PHP代码将图像上传到文件夹，但我也想允许上传pdf文件，所以我修改了一些代码：
<?php
$target_dir = "extra_images/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
$textFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
//echo "<div class=\"alert alert-success\" role=\"alert\"><strong><span class=\"glyphicon glyphicon-ok\" aria-hidden=\"true\"></span> Correct image type.</strong></div>";
$uploadOk = 1;
} else {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>File is not an image.</strong></div>";
$uploadOk = 0;
}
}
// Check if file already exists
if (file_exists($target_file)) {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>File already exists.</strong></div>";
$uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 3750000) {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>Your file is too large.</strong></div>";
$uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" && $imageFileType != "gif" && $textFileType != "pdf" ) {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>Only jpg, jpeg, png, gif and pdf (for the Plan Article) files are allowed.</strong></div>";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>The file was not uploaded.</strong></div>";
// if everything is ok, try to upload file
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
echo "<div class=\"alert alert-success\" role=\"alert\">The file <strong>". basename( $_FILES["fileToUpload"]["name"]). "</strong> has been uploaded.</div><br>Please copy this filename: <span class=\"form-inline\"><input type=\"text\" value=\"". basename( $_FILES["fileToUpload"]["name"]). "\" class=\"form-control input-sm\" style=\"width:220px;\" /></span> And paste it in an empty Extra image field above and save the form.";
} else {
echo "<div class=\"alert alert-danger\" role=\"alert\">There was an error uploading your file.</div>";
}
}
echo "</br></br><p><button class=\"btn btn-default pull-right\" style=\"margin-right:5px;\" type=\"submit\" onclick=\"javascript:history.go(-1)\"><span class=\"glyphicon glyphicon-step-backward\" aria-hidden=\"true\"></span> Back</button></p>";
?>
我添加了这一点：
&& $textFileType != "pdf" and this: $textFileType = pathinfo($target_file,PATHINFO_EXTENSION);
但是我所做的这些更改无效，它仍会返回"this is not an image"消息。
代码的哪一部分标识文件类型？ $ imageFileType是php用来识别文件类型的特殊变量吗？
我真的对此感到困惑。有人可以帮忙吗？答案 0 :(得分：0)
如果要检查扩展名，pdf的文件类型为application/pdf。
但是，虽然您可以检查文件扩展名，但这不是识别文件是否为pdf的非常可靠的方法（它几乎可以为任何文件更改文件扩展名，创造了一个巨大的安全漏洞）。
虽然像getimagesize()这样的pdf中没有任何内容，但你仍然可以检查mime类型，这是一个相当好的步骤，如下所示：
if (!empty($_FILES['fileToUpload']['tmp_name'])) {
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mime = finfo_file($finfo, $_FILES['fileToUpload']['tmp_name']);
if ($mime != 'application/pdf') {
echo 'this is not a PDF file!';
exit();
}
答案 1 :(得分：0)
感谢所有的帮助，经过一些代码摔跤，这是最终的功能版本：
<?php
$target_dir = "extra_images/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
/*if(isset($_POST["submit"])) {
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
//echo "<div class=\"alert alert-success\" role=\"alert\"><strong><span class=\"glyphicon glyphicon-ok\" aria-hidden=\"true\"></span> Correct image type.</strong></div>";
$uploadOk = 1;
} else {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>File is not an image.</strong></div>";
$uploadOk = 0;
}
}*/
// Check if file already exists
if (file_exists($target_file)) {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>File already exists.</strong></div>";
$uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 3750000) {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>Your file is too large.</strong></div>";
$uploadOk = 0;
}
// Allow certain file formats
/*if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" && $imageFileType != "gif" ) {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>Only jpg, jpeg, png, gif and pdf (for the Plan Article) files are allowed.</strong></div>";
$uploadOk = 0;
}*/
//Check for pdf format
if (!empty($_FILES['fileToUpload']['tmp_name'])) {
$finfo = finfo_open(FILEINFO_MIME_TYPE);
$mime = finfo_file($finfo, $_FILES['fileToUpload']['tmp_name']);
if (($mime != 'application/pdf') && ($mime != 'image/jpg') && ($mime != 'image/jpeg') && ($mime != 'image/gif') && ($mime != 'image/png')) {
$uploadOk = 0;
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>This file is not a valid file.</strong></div>";
//exit();
}} //this bracket was missing I think
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
echo "<div class=\"alert alert-danger\" role=\"alert\"><strong>The file was not uploaded.</strong></div>";
// if everything is ok, try to upload file
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
echo "<div class=\"alert alert-success\" role=\"alert\">The file <strong>". basename( $_FILES["fileToUpload"]["name"]). "</strong> has been uploaded.</div><br>Please copy this filename: <span class=\"form-inline\"><input type=\"text\" value=\"". basename( $_FILES["fileToUpload"]["name"]). "\" class=\"form-control input-sm\" style=\"width:220px;\" /></span> And paste it in an empty Extra image field above and save the form.";
} else {
echo "<div class=\"alert alert-danger\" role=\"alert\">There was an error uploading your file.</div>";
}
}
echo "</br></br><p><button class=\"btn btn-default pull-right\" style=\"margin-right:5px;\" type=\"submit\" onclick=\"javascript:history.go(-1)\"><span class=\"glyphicon glyphicon-step-backward\" aria-hidden=\"true\"></span> Back</button></p>";
?>
关于＆amp;＆amp; / ||问题，起初我也有使用||的想法运算符，我尝试了它并没有用，可能是因为我们使用！=进行比较所以如果某些文件不是jpg，而不是pdf ......等等它是不允许的并且得到错误信息和＆amp; ; uploadOK = 0所以不会上传。
查看代码，这是写的，但仍违背我的逻辑：）
非常感谢您的帮助;）