我有以下 PHP 代码，它允许输入详细信息并上传文件。但是，即使没有上传文件，我也希望脚本能够执行。我提到了诸如如何检查用户是否在 PHP 中上传文件 以及如何测试用户是否选择了要上传的文件 但以某种方式没有帮助我的问题。请检查我的代码并告诉我我错在哪里。谢谢你。
PHP 文件：
<?php
require('PHPMailer/class.phpmailer.php');
if(isset($_POST['email'])) {
// EDIT THE 2 LINES BELOW AS REQUIRED
//$email_subject = "Request for Portfolio check up from ".$first_name." ".$last_name;
$title = array('Title', 'Mr.', 'Ms.', 'Mrs.');
$selected_key = $_POST['title'];
$selected_val = $title[$_POST['title']];
$first_name = $_POST['first_name']; // required
$last_name = $_POST['last_name']; // required
$email_from = $_POST['email']; // required
$telephone = $_POST['telephone']; // not required
$comments = $_POST['comments']; // required
if(($selected_key==0))
{
die("<script>alert('Please enter your title'); window.location.href='main.php';</script>");
}
function clean_string($string) {
$bad = array("content-type","bcc:","to:","cc:","href");
return str_replace($bad,"",$string);
}
$email_message = "Name: ".$selected_val." ".clean_string($first_name)." ".clean_string($last_name)."<br />Email id: ".clean_string($email_from)."<br />Telephone no: ".clean_string($telephone)."<br />Details: ".clean_string($comments);
$allowedExts = array("doc", "docx", "xls", "xlsx", "pdf");
$temp = explode(".", $_FILES["file"]["name"]);
$extension = end($temp);
if ((($_FILES["file"]["type"] == "application/pdf")
|| ($_FILES["file"]["type"] == "application/msword")
|| ($_FILES["file"]["type"] == "application/excel")
|| ($_FILES["file"]["type"] == "application/vnd.ms-excel")
|| ($_FILES["file"]["type"] == "application/x-excel")
|| ($_FILES["file"]["type"] == "application/x-msexcel")
|| ($_FILES["file"]["type"] == "application/vnd.openxmlformats-officedocument.wordprocessingml.document")
|| ($_FILES["file"]["type"] == "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")) && ($_FILES["file"]["size"] <= 20000)
|| file_exists($_FILES['file']['tmp_name']) || is_uploaded_file($_FILES['file']['tmp_name']) && in_array($extension, $allowedExts))
{
if ($_FILES["file"]["error"] != 0)
{
echo "<script>alert('Error: " . $_FILES["file"]["error"] ."')</script>";
}
else
{
$d='upload/';
$de=$d . basename($_FILES['file']['name']);
$u=move_uploaded_file($_FILES["file"]["tmp_name"], $de);
$fileName = $_FILES['file']['name'];
$filePath = $_FILES['file']['tmp_name'];
//add only if the file is an upload
//if($u)
//echo "Uploaded!";
}
}
else
{
die("<script>alert('Invalid file'); window.location.href='main.php';</script>");
}
// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
//Create a new PHPMailer instance
$mail = new PHPMailer();
//Tell PHPMailer to use SMTP
$mail->IsSMTP();
//Enable SMTP debugging
// 0 = off (for production use)
// 1 = client messages
// 2 = client and server messages
$mail->SMTPDebug = 0;
//Ask for HTML-friendly debug output
$mail->Debugoutput = 'html';
//Set the hostname of the mail server
$mail->Host = "***";
//Set the SMTP port number - likely to be 25, 465 or 587
$mail->Port = 25;
//Whether to use SMTP authentication
$mail->SMTPAuth = true;
//Username to use for SMTP authentication
$mail->Username = "***";
//Password to use for SMTP authentication
$mail->Password = "***";
//Set who the message is to be sent from
$mail->SetFrom($email_from, $first_name.' '.$last_name);
//Set an alternative reply-to address
//$mail->AddReplyTo('replyto@example.com','First Last');
//Set who the message is to be sent to
$mail->AddAddress('***', '***');
//Set the subject line
$mail->Subject = 'Request for Portfolio Check up';
//Read an HTML message body from an external file, convert referenced images to embedded, convert HTML into a basic plain-text alternative body
$mail->Body=$email_message;
//Replace the plain text body with one created manually
$mail->AltBody = 'This is a plain-text message body';
//Attach an image file
//$mail->AddAttachment($file);
$mail->AddAttachment($de);
//Send the message, check for errors
if(!$mail->Send()) {
echo "<script>alert('Mailer Error: " . $mail->ErrorInfo."')</script>";
} else {
$headers1 = 'From: ***'."\r\n".
'Reply-To: ritu@rsadvisories.com'."\r\n" .
'X-Mailer: PHP/' . phpversion();
mail($email_from,'Re:Request for Portfolio Check up','We Have received your mail. We will contact you soon.',$headers1);
echo "<script>alert('Your request has been submitted. We will contact you soon.');window.location.href='main.php';</script>";
}
}
?>
编辑：当我尝试在没有文件的情况下上传时返回此错误（运行这部分代码）
else
{
die("<script>alert('Invalid file'); window.location.href='main.php';</script>");
}