why am I getting a MySQl error - php

Question

I am getting this error when I run the below code. I dont know why I am getting this error. I echoed the query to make sure that the syntax is correct I checked the query in a syntax checker to make sure that the query contains no syntax errors. and even tested in PHP my admin.
The query that is producing this error is the query that is in the for loop with numberofcolor and numberofsizes
Error description: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1' at line 1
<?php include('includes/db.php'); include('../functions/functions.php');?>
<?php require './p_struct/head.php';?>
<?php require './p_struct/header.php';?>
<?php require './p_struct/sidenav.php';?>
<div class="main" style="font-size: 20px">
<form action="insert_product.php" method="post" enctype="multipart/form-data" class="form-horizontal" id="chells">
<table>
<tr>
<td>Name</td>
<td><input type="text" name="product_title" required="required"></td>
</tr>
<tr>
<td>category</td>
<td><select name="product_category" >
<option>Select a Category</option>
<?php
$get_cats = " select * from categories";
$run_cats = mysqli_query($con, $get_cats);
while($row_cats = mysqli_fetch_array($run_cats))
{
$cat_id = $row_cats['cat_id'];
$cat_title = $row_cats['cat_data'];
echo "
<option vallue = '$cat_id' >$cat_title </option>
";
}
?>
</select></td>
</tr>
<tr>
<td>featured</td>
<td><select name="product_featured" >
<option>featured</option>
<option>not featured</option>
</select></td>
</tr>
<tr>
<td>price</td>
<td><input type="text" name="product_price" required="required"></td>
</tr>
<tr>
<td>image</td>
<td><input type="file" name="product_image" required="required"></td>
</tr>
<tr>
<td>big image</td>
<td><input type="file" name="product_big_image" required="required"></td>
</tr>
<tr>
<td>cart image</td>
<td><input type="file" name="product_cart_image" required="required"></td>
</tr>
<tr>
<td>keywords</td>
<td><input type="text" name="product_keywords" required="required"></td>
</tr>
<tr>
<td> Colors</td>
<td>
<div class="checkbox">
<?php
$get_colors = "SELECT * FROM `product_colors`";
$run_get_colors = mysqli_query($con, $get_colors);
while($row_get_color = mysqli_fetch_array($run_get_colors))
{
$colorS = $row_get_color['color'];
echo '<label class="checkbox-inline" ><input type="checkbox" name = "mycolor[]" value="'.$colorS.'" >'.$colorS.'</label>';
}
?>
</div>
</td>
</tr>
<tr>
<td> Sizes</td>
<td>
<div class="checkbox">
<?php
$get_sizes = "SELECT * FROM `product_sizes`";
$run_get_sizes = mysqli_query($con, $get_sizes);
while($row_get_sizes = mysqli_fetch_array($run_get_sizes))
{
$sizesS = $row_get_sizes['size'];
echo '<label class="checkbox-inline" ><input type="checkbox" name = "mysizes[]" value="'.$sizesS.'" >'.$sizesS.'</label>';
}
?>
</div>
</td>
</tr>
<tr>
<td>description</td>
<td><textarea name="product_description" cols="20" rows="5" ></textarea></td>
</tr>
<tr>
<td><input type="submit" value="Add Product" name="insert_post"></td>
</tr>
</table>
</form>
</body>
</html>
<?php
global $con;
if( isset($_POST['insert_post']))
{
$a = rand(100, 999);
$b = rand(100, 999);
$product_id = $a.$b;
$product_title = $_POST['product_title'];
$product_category = $_POST['product_category'];
$product_featured = $_POST['product_featured'];
$product_price = $_POST['product_price'];
$product_keywords = $_POST['product_keywords'];
$product_description = $_POST['product_description'];
$color_array = $_POST['mycolor'];
$sizes_array = $_POST['mysizes'];
$product_image = $_FILES['product_image']['name'];
$product_big_image = $_FILES['product_big_image']['name'];
$product_cart_image = $_FILES['product_cart_image']['name'];
$product_image_tmp = $_FILES['product_image']['tmp_name'];
$product_big_image_tmp = $_FILES['product_big_image']['tmp_name'];
$product_cart_image_tmp = $_FILES['product_cart_image']['tmp_name'];
move_uploaded_file($product_image_tmp,"product_images/$product_image");
move_uploaded_file($product__big_image_tmp,"product_big_images/$product_big_image");
move_uploaded_file($product_cart__image_tmp,"product_cart_images/$product_cart_image");
$insert_product = " insert into products (product_id,product_cat, product_featured, product_title, product_price, product_desc,product_image,product_big_image,product_cart_image,product_keywords) values ($product_id,'$product_category','$product_featured','$product_title','$product_price','$product_description','$product_image','$product_big_image','$product_cart_image','$product_keywords')";
$run_insert_query = mysqli_query($con, $insert_product);
$number_of_colors = count($color_array);
for($i=0; $i <$number_of_colors; $i++)
{
$curr_color_value = $color_array[$i];
$add_color_att = "INSERT INTO `attributes`( `id`, `att_type`, `att_value`) VALUES ($product_id, 'color','$curr_color_value');";
$run_add_color_att = mysqli_query($con, $add_color_att);
/* if($run_add_color_att)
{
echo "COLOR ADDED!";
}
else {
echo "COLOR NOT ADDED!";
}*/
}
$number_of_sizes = count($sizes_array);
for($s=0; $s <$number_of_sizes; $s++)
{
$curr_size_value = $number_of_sizes[$s];
$add_size_att = "INSERT INTO `attributes`( `id`, `att_type`, `att_value`) VALUES ($product_id, `size`,`$curr_size_value`)";
$run_add_size_att = mysqli_query($con, $add_size_att);
/* if($run_add_size_att)
{
echo "SIZE ADDED!";
}
else {
echo "SIZE NOT ADDED!";
}*/
}
if($run_insert_query)
{
echo "PRODUCT ADDED!";
}
else {
echo "PRODUCT NOT ADDED!";
}
} ?>
</div>

Answer 1

$add_size_att = "INSERT INTO `attributes`( `id`, `att_type`, `att_value`) VALUES ($product_id, `size`,`$curr_size_value`)";
your using the incorrect quote type here the ` should be ' around the string values:
$add_size_att = "INSERT INTO `attributes`( `id`, `att_type`, `att_value`) VALUES ($product_id, 'size','$curr_size_value')";
also should size be $size?