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基本上我正在尝试做的是 - 创建一个页面来上传文件。下面是代码及其工作罚款：如何从javascript中调用php函数
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function wow_default_alert() {alert("Successfully saved!"); }
</script>
</head>
<body>
<form action="index.php" method="post" name="myForm" enctype="multipart/form-data">
Select image to upload:
<input type="file" name="fileToUpload" id="fileToUpload">
<input type="submit" value="Upload Image" name="submit">
</form>
<?php
if(isset($_POST["submit"])) {
if (!file_exists('.\\tigerimg\\'))
{
mkdir('.\\tigerimg\\', 0777, true);
}
$target_dir = '.\\tigerimg\\';
$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
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
"File is an image - " . $check["mime"] . ".";
$uploadOk = 1;
} else {
"File is not an image.";
$uploadOk = 0;
}
// Check if file already exists
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif") {
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file))
{
// echo "The file ". basename($_FILES["fileToUpload"]["name"]). " has been uploaded.";
echo '<script type="text/javascript">
wow_default_alert();
</script>';
} else {
echo "Sorry, there was an error uploading your file.";
}
}
}
?>
但问题是，如果我再刷新页面-after成功上传一个文件，它的工作原理与同一职位的值。
以前我使用下面的代码来取消设置发布数据 - 这对其他页面起作用。
清晰代码1
<?php
session_start();
if(strcasecmp($_SERVER['REQUEST_METHOD'],"POST") === 0)
{
$_SESSION['postdata'] = $_POST;
header("Location: ".$_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING']);
exit;
}
if(isset($_SESSION['postdata']))
{
$_POST = $_SESSION['postdata'];
unset($_SESSION['postdata']);
}
?>
，但我不能在这一个使用它。它显示错误：
Undefined index: fileToUpload in C:\xampp\htdocs\up\index.php on line 41
Notice: Undefined index: fileToUpload in C:\xampp\htdocs\up\index.php on line 47
Warning: getimagesize(): Filename cannot be empty in C:\xampp\htdocs\up\index.php on line 47
Notice: Undefined index: fileToUpload in C:\xampp\htdocs\up\index.php on line 62
所以，我试图也清楚FILES阵列太通过添加3行与上面的代码。
清晰代码2
<?php
session_start();
if(strcasecmp($_SERVER['REQUEST_METHOD'],"POST") === 0)
{
$_SESSION['postdata'] = $_POST;
$_SESSION['filedata'] = $_FILES; //new code
header("Location: ".$_SERVER['PHP_SELF']."?".$_SERVER['QUERY_STRING']);
exit;
}
if(isset($_SESSION['postdata']))
{
$_POST = $_SESSION['postdata'];
$_FILES = $_SESSION['filedata']; //new
unset($_SESSION['postdata']);
unset($_SESSION['filedata']); //new
}
?>
，但现在它仅显示一个错误：
Warning: getimagesize(C:\xampp\tmp\php1A2F.tmp): failed to open stream: No such file or directory in C:\xampp\htdocs\up\index.php on line 51.
>>>所以，这里是一个question-为什么会出现这种情况？
好了，现在我想另一种方式把上面的[清楚代码1] PHP函数功能remove_post（）里面并调用它只是成功uploading-的代码后，在那里我叫警报。
这次它的工作正常。但现在问题是没有出现警报。那么，当用户单击alert中的ok时，是否可以调用remove_post（）函数。
你不能直接从客户端脚本调用PHP函数。如果你想要一个php函数的结果，你可以使用ajax来连接它。请记住，新的获取或发布是一个分离的过程。 – Codebeat