PHP INSERT INTO MySQL无法正常工作，没有给出错误

Question

I am currently trying to execute an INSERT INTO when a search button is clicked. Eventually I'd like to submit the search term into the database, however I'm currently just trying to submit a simple string to ensure the initial INSERT INTO works correctly, which it currently doesn't.

I have the following:

<form name="form1" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <input type="search" name="search" id="results" placeholder="Enter search">
    <input type="submit" name="submit" class="frstBtn" value="searchterm"><br>
</form>

<?php
        $searchterm = "";
    ?>
<?php
        if(isset($_POST['submit']))
        {
            $sql = "INSERT INTO tableName (variableName) VALUES ('test')";
            $results = mysqli_query($conn,$sql) or die(mysqli_error());
        }
        ?>

The latter php function, search, works perfectly fine, but the former function including the INSERT INTO does not.

Here is the table itself in phpmyadmin.

I have successfully manually copied and pasted the actual INSERT INTO statement into the actual database and it has worked fine, so I know the issue isn't with the statement. Any help is much appreciated. Thanks.

Answer 1

Since the searchTerm column is defined as PRIMARY, I’m ready to bet that you are trying to insert the same value twice and you don't have enabled the error_reporting. To find out exactly what the problem is, first of all enable all errors by adding the following at the beginning of your script:

ini_set('error_reporting', -1);
ini_set('display_errors', 1);

Also, note that you must use mysqli_error($conn) instead of mysqli_error().

By the way, to ignore errors when inserting unique values, use:

INSERT IGNORE INTO searchHistory(searchTerm) VALUES ('test')