You have several problems with your line.
echo "<td><form action=\"del_prod.php\" method=\"post\"><input type=\"checkbox\" name=\"product_id\" value=\"".$row['product_id']."\" /></td>";
- You’re not escaping the double quotes.
 - You are missing the opening < on the input tag.
 - You’re not closing the input tag.
 - You’re not concatenating the $row[‘product_id’] in the string properly.
 - You’re missing a semi-colon.
 
This is all aside from the fact that the form tag shouldn’t really be in the <td>. It should be outside of the table, or better yet without a table at all! 🙂
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solved Parse error: syntax error, unexpected T_STRING, expecting ‘,’ or ‘;’ for echo statement with variables [closed]