Not working. Validation and sanitizing via PHP suddenly not working - php

Question

I have a weird problem. First of all, before I did form validation via PHP, I could insert and display data ( I have at least 30 fields). Then after I did validation and sanitizing, suddenly I cannot insert and display data. After I remove some fields and columns in the database, which left me a few, now I can insert data and display data, but if I add more than lets say 5 or 6 fields, I cannot insert data. Please tell me what's wrong?
<?php
echo var_dump($_POST);
echo var_dump($_FILES);
print_r($_SESSION);
error_reporting(E_ALL);
ini_set("display_errors",1);
//define variables and define to null.
$adtitleError = $dcrptnError = $rmError = $advertnameError = $apE = "";
$adtitle = $dcrptn = $rm = $advertname = $ap = "";
//Retrieve the field values from registration form.
$adtitle = !empty($_POST ['adtitle']) ? trim($_POST['adtitle']) : null;
$dcrptn = !empty($_POST ['dcrptn']) ? trim($_POST['dcrptn']) : null;
$rm = !empty($_POST ['rm']) ? trim($_POST['rm']) : null;
$advertname = !empty($_POST ['advertname']) ? trim($_POST['advertname']) : null;
$ap = !empty($_POST ['adphone']) ? trim($_POST['adphone']) : null;
function test_input($data){
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
$formValid = true;
if(isset($_POST["submit"])){
//insert record
if($conn->connect_error)
{die("Connection failed:".$conn->connect_error);}
$id=isset($_POST['id'])?$_POST['id']:"";
//insert data
$statement = $conn->prepare("INSERT INTO useradvert(id,image1,adtitle,dcrptn,rm,advertname,adphone)VALUES (?,?,?,?,?,?,?)");
//bind param
$statement->bind_param("issssss",$id,$target_file,$adtitle,$dcrptn,$rm,$advertname,$ap);
$target_file=isset($_FILES['image'])?$_FILES['image']:"";
$adtitle=isset($_POST['adtitle'])?$_POST['adtitle']:"";
$dcrptn=isset($_POST['dcrptn'])?$_POST['dcrptn']:"";
$rm=isset($_POST['rm'])?$_POST['rm']:"";
$advertname=isset($_POST['advertname'])?$_POST['advertname']:"";
$ap=isset($_POST['adphone'])?$_POST['adphone']:"";
//bind the variables to be called at other places
if (empty($adtitle)){
$adtitleError = "Ad title is required. Select category to activate form.";
$formValid = false;
}else{
$adtitle = test_input($_POST["adtitle"]);
// check name only contains letters and whitespace
if (!preg_match('/^[a-zA-Z\s]{3,50}+$/', $adtitle)) {
$adtitleError = "Letters only & spaces,(min 3),e.g: a, A)";
$formValid = false;
}
}
if (empty($dcrptn)){
$dcrptnError = "Decsription is required. Select category to activate form.";
$formValid = false;
}
if (empty($rm)){
$rmError = "A value is required, e.g: 123000 or 12,300.00. Select category to activate form.";
$formValid = false;
}
else{
$rm = test_input($_POST["rm"]);
// check name only contains letters and whitespace
if (!preg_match('/^[0-9]+(?:\.[0-9]{1,13})?$/',$rm)) {
$rmError = "Invalid value.E.g: 123000.45. Select category to activate form.";
$formValid = false;
}
}
if (empty($advertname)){
$advertnameError = "Name is required. Select category to activate form.";
$formValid = false;
}
else{
$advertname = test_input($_POST["advertname"]);
// check name only contains letters and whitespace
if (!preg_match('/^[a-zA-Z\s]{3,50}+$/',$advertname)) {
$advertnameError = "Letters only & spaces,(min 3),(e.g: a, A). Select category to activate form.";
$formValid = false;
}
}
if (empty($ap)){
$apE = "Tel number is required. Select category to activate form.";
$formValid = false;
}
else{
$ap= test_input($_POST["adphone"]);
// check name only contains letters and whitespace
if (!preg_match('/^\d{9,11}+$/',$ap)) {
$apE = "Invalid tel no format.( E.g:0123456789). Select category to activate form.";
$formValid = false;
}
}
//image
$target_dir="uploads/";
$target_file=$target_dir.basename($_FILES["image1"]["name"]);
$uploadOk=1;
$imageFileType=pathinfo($target_file,PATHINFO_EXTENSION);
//script for targetfile -image
// Check if image or not
$check=getimagesize($_FILES["image1"]["tmp_name"]);
if($check!==false){
echo "File is an image - ".$check["mime"].".";
$uploadOk=1;
}else{
echo "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["image1"]["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($_FILES["image1"]["tmp_name"],$target_file)) {
echo "The file ".basename($_FILES["image1"]["name"])."has been uploaded.";
}else{
echo "Sorry, there was an error uploading your file.";
}
}
if ($formValid){
$statement->execute();
header('Location: userpppp.php');
exit;
}
}
?>