我有一个ajax上传脚本，我将在下面发布。它将上传任何扩展名的任何文件。我希望它只上传.png文件，但我不知道该怎么做。
这是我的文件：
<h1>Ajax File Upload Demo</h1>
<form id="myForm" action="upload.php" method="post" enctype="multipart/form-data">
Name it:
<input type="text" name="upload_name">
<br>
<input type="file" size="60" name="myfile">
<input type="submit" value="Ajax File Upload">
</form>
<div id="progress">
<div id="bar"></div>
<div id="percent">0%</div >
</div>
<br/>
<div id="message"></div>
<script>
$(document).ready(function()
{
var options = {
beforeSend: function()
{
$("#progress").show();
//clear everything
$("#bar").width('0%');
$("#message").html("");
$("#percent").html("0%");
},
uploadProgress: function(event, position, total, percentComplete)
{
$("#bar").width(percentComplete+'%');
$("#percent").html(percentComplete+'%');
},
success: function()
{
$("#bar").width('100%');
$("#percent").html('100%');
},
complete: function(response)
{
$("#message").html("<font color='green'>"+response.responseText+"</font>");
},
error: function()
{
$("#message").html("<font color='red'> ERROR: unable to upload files</font>");
}
};
$("#myForm").ajaxForm(options);
});
</script>
.PHP：
<?php
$upload_name = $_POST['upload_name'];
$idx = strpos($_FILES['myfile']['name'],'.');
$ext = substr($_FILES['myfile']['name'],$idx);
$file_name = $upload_name . $ext;
$output_dir = "uploads/";
if(isset($_FILES["myfile"]))
{
//Filter the file types , if you want.
if ($_FILES["myfile"]["error"] > 0)
{
echo "Error: " . $_FILES["file"]["error"] . "<br>";
}
else
{
//move the uploaded file to uploads folder;
// move_uploaded_file($_FILES["myfile"]["tmp_name"],$output_dir. $_FILES["myfile"]["name"]);
// echo "Uploaded File :".$_FILES["myfile"]["name"];
move_uploaded_file($_FILES["myfile"]["tmp_name"],$output_dir.$file_name);
echo "Uploaded File :" . $file_name;
}
}
?>
抱歉，我是新手，代码块对我不起作用。如果有人可以更新，那就太好了。
客户端
更改输入文件字段 这仅适用于现代浏览器 IE10+谷歌浏览器 8.0+ 和火狐 4.0+
<input type="file" size="60" name="myfile" accept="image/png" />
.PHP
$ext = pathinfo( $file_name , PATHINFO_EXTENSION );
if(strtolower($ext) == 'png' && $_FILES["file"]['type'] == "image/png")
{
// upload file
} else{
// not allowed
}
您可以在服务器端检查文件扩展名或 MIME 类型。
// check extension
$info = new SplFileInfo($_FILES['myfile']['name']);
if ($info->getExtension() !== 'png') {
// return error
}
// or check file mime type
if (mime_content_type($_FILES['myfile']['name']) !== 'image/png') {
// return error
}
示例 php：
$output_dir = "uploads/";
$upload_name = $_POST['upload_name'];
if(isset($_FILES["myfile"])) {
// Check upload errors
if ($_FILES["myfile"]["error"] > 0) {
echo "Error: " . $_FILES["file"]["error"] . "<br>";
return;
}
// Check extensions
$info = new SplFileInfo($_FILES['myfile']['name']);
if ($info->getExtension() !== 'png') {
echo "Error: Only .png files are allowed";
return;
}
// Upload file
$file_name = $upload_name . $info->getExtension();
move_uploaded_file($_FILES["myfile"]["tmp_name"], $output_dir . $file_name);
echo "Uploaded File :" . $file_name;
}