How to submit form data with optional upload file - php

Question

How can I submit form data with an optional upload file. I mean, can I submit form data together with an uploaded file? But I want to make the upload file optional. Here is the my code :
<?php
define ("MAX_SIZE","5000");
$errors=0;
if(($_SERVER["REQUEST_METHOD"] == "POST") && isset($_FILES["file"]["size"]) && ($_FILES["file"]["size"] > 0))
{
$image =$_FILES["file"]["name"];
$uploadedfile = $_FILES['file']['tmp_name'];
if ($image)
{
$filename = stripslashes($_FILES['file']['name']);
$extension = getExtension($filename);
$extension = strtolower($extension);
if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif"))
{
$change='<div class="msgdiv">Unknown Image extension </div> ';
$errors=1;
}
else
{
$size=filesize($_FILES['file']['tmp_name']);
if ($size > MAX_SIZE*1024)
{
$change='<div class="msgdiv">You have exceeded the size limit!</div> ';
$errors=1;
}
if($extension=="jpg" || $extension=="jpeg" )
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);
}
else if($extension=="png")
{
$uploadedfile = $_FILES['file']['tmp_name'];
$src = imagecreatefrompng($uploadedfile);
}
else
{
$src = imagecreatefromgif($uploadedfile);
}
echo $scr;
list($width,$height)=getimagesize($uploadedfile);
$newwidth=500;
$newheight=($height/$width)*$newwidth;
$tmp=imagecreatetruecolor($newwidth,$newheight);
$newwidth1=300;
$newheight1=($height/$width)*$newwidth1;
$tmp1=imagecreatetruecolor($newwidth1,$newheight1);
imagealphablending($tmp1, false);
imagesavealpha($tmp1, true);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
imagecopyresampled($tmp1,$src,0,0,0,0,$newwidth1,$newheight1,$width,$height);
$image_name=time().'_'.$_FILES['file']['name'];
$filename = "images/". $image_name;
$filename1 = "images/small_". $image_name;
$uid=$_SESSION['uid'];
imagejpeg($tmp,$filename,100);
imagejpeg($tmp1,$filename1,100);
imagedestroy($src);
imagedestroy($tmp);
imagedestroy($tmp1);
}}
}
if(isset($_POST['Submit']) && !$errors )
{
$category_group= $_POST['category_group'];
$title=$_POST['title'];
$details=$_POST['details'];
$ad_keywords=$_POST['ad_keywords'];
$category_state=$_POST['category_state'];
$category_city=$_POST['category_city'];
$address=$_POST['address'];
$telephone=$_POST['telephone'];
$email=$_POST['email'];
$website=$_POST['website_link'];
$price=$_POST['price'];
$filename= ($_FILES["file"]["size"] > 0) ? $filename : '';
$filename1= ($_FILES["file"]["size"] > 0) ? $filename1 : '';
$url=time().'-'. createUrl($title);
if(!$category_group || !category_city || !$title || !$details || !$category_state ){
echo "enter state and city name";
}else{
try{
$sth = $dbh->prepare("
INSERT INTO
advertisement(user_id,ad_image_big,ad_image_small,ad_cat_group,ad_title,ad_details,ad_state,ad_city,ad_address,ad_telephone,ad_email,ad_website,ad_price,ad_slug,ad_keywords)
VALUES(:field1,:field2,:field3,:field4,:field5,:field6,:field7,:field8,:field9,:field10,:field11,:field12,:field13,:field14,:field15)
");
$sth->execute(array(':field1' => $uid, ':field2' => $filename, ':field3' => $filename1, ':field4' => $category_group, ':field5' => $title, ':field6' => $details, ':field7' => $category_state,':field8'=> $category_city, ':field9' => $address, ':field10' => $telephone,':field11'=> $email,':field12'=> $website, ':field13' => $price, ':field14' => $url , ':field15'=> $ad_keywords));
}catch (PDOException $ex){
echo "An Error occured while inserting data to database";
some_logging_function($ex->getMessage());
}
header('location:success.php');
}
}
?>
Whenever I try to submit the form without the upload file I get this error:
"An Error occurred while inserting data to database"
which is in the catch section. If I upload a file, I get a success message without any error. Help me please.

Answer 1

Here is the code I made not long ago... Had the same problem :)
The form itself:
<form action="index.php" method="post" enctype='multipart/form-data'>
<input class="header_input" type="text" name="header" />
<br/><span class="input_headers"><p>Content</p></span>
<textarea class="textarea_input" rows="10" cols="30" name="content">
</textarea><br />
Select File: <input type='file' name='filename' size='10' /><br />
<input type="submit" class="submit" />
</form>
Altho it doesn't check, wether something is inputed into the "Header" and "Content" section, so try to fix that:
if (isset($_POST['header']) && isset($_POST['content'])) {
$header = mysql_real_escape_string(htmlentities($_POST['header']));
$content = mysql_real_escape_string(nl2br(htmlentities($_POST['content'])));
$sql = mysqli_query($con,"INSERT INTO posts (Header, Content) VALUES
('{$header}','{$content}')");
}
And this uploads the image, if there is one:
if (isset($_FILES['filename']['name'])) {
$name = htmlentities($_FILES['filename']['name']);
$allowedExts = array("gif", "jpeg", "jpg", "png");
$extension = end(explode(".", $_FILES['filename']['name']));
if ((($_FILES['filename']['type'] == "image/gif")
|| ($_FILES['filename']['type'] == "image/jpeg")
|| ($_FILES['filename']['type'] == "image/jpg")
|| ($_FILES['filename']['type'] == "image/pjpeg")
|| ($_FILES['filename']['type'] == "image/x-png")
|| ($_FILES['filename']['type'] == "image/png"))
&& ($_FILES['filename']['type'] < 20000)
&& in_array($extension, $allowedExts)) {
$result = mysqli_query($con,"SELECT * FROM posts WHERE PID=(SELECT max(PID) FROM posts)");
$row = mysqli_fetch_array($result);
$id = $row['PID'];
$new_name = $id . "_" . "000" . ".jpg";
if (file_exists("images/" . $new_name)) {
$new_name_ex = $id . "_" . "001" . ".jpg";
move_uploaded_file($_FILES['filename']['tmp_name'],"images/" . $new_name_ex);
$sql = mysqli_query($con,"UPDATE posts SET Images='{$new_name_ex}' WHERE PID='{$id}'");
} else {
move_uploaded_file($_FILES['filename']['tmp_name'],"images/" . $new_name);
$sql = mysqli_query($con,"UPDATE posts SET Images='{$new_name}' WHERE PID='{$id}'");
}
}
}
Hope that helps :) I am new to PHP, so maybe there is a way to make all of this code more simple, altho I hope it answers your question

Answer 2

From PHP Documentation (http://php.net/manual/en/features.file-upload.post-method.php), Example #3 Uploading array of files does pretty much what you need by walking through each file (in case you have an array of files) then the if statement checks whether the file is there. The code below is from the PHP documentation:
foreach ($_FILES["pictures"]["error"] as $key => $error) {
if ($error == UPLOAD_ERR_OK) {
$tmp_name = $_FILES["pictures"]["tmp_name"][$key];
$name = $_FILES["pictures"]["name"][$key];
move_uploaded_file($tmp_name, "data/$name");
}
}
If there's no file, the code simply skips the upload and move on to the next.