I cannot find a way to display "No Results." - php

Question

The code below works as written provided a name in the database is entered in the search box. If a name not in the data base is entered, the error 'Warning: Invalid argument supplied for foreach() ….. on line 201.' Rather than this generic error I want something like “No Results” to display. Any suggestions anyone? I am aware that this question has been asked before but none of the answers seem to match the type of output I am using here.
enter code here
<?php
include 'connect.php';
if (isset($_POST['submit-keyword'])) {
$keyword = $_POST['keyword'];
}
try {
//first pass just gets the column names
print "<table>";
$result = $con->query("SELECT * FROM Bath_Wells_NBR WHERE Founder LIKE '%$keyword%' ORDER BY DATE");
//return only the first row (we only need field names)
$row = $result->fetch(PDO::FETCH_ASSOC);
print " <tr>";
foreach ($row as $field => $value){
print " <th>$field</th>";
}
// end foreach
print " </tr>";
//second query gets the data
$data = $con->query("SELECT * FROM Bath_Wells_NBR WHERE Founder LIKE '%$keyword%' ORDER BY DATE");
$data->setFetchMode(PDO::FETCH_ASSOC);
foreach($data as $row){
print " <tr>";
foreach ($row as $name=>$value){
print " <td>$value</td>";
} // end field loop
print " </tr>";
} // end record loop
print "</table>";
} catch(PDOException $e) {
echo 'ERROR: ' . $e->getMessage();
} // end try
?>

Answer 1

the first thing you need to do is make use of the PDO object and actually use the prepared statement to avoid sql injection like this:
$keyword = '%' . $keyword . '%';
$q = $con->prepare("SELECT * FROM Bath_Wells_NBR WHERE Founder LIKE :keyword ORDER BY DATE");
$q->bindParam(':keyword',$keyword,PDO::PARAM_STR);
$q->execute();
//here we will use fetchAll to get the full dataset of results, or an empty array
$result = $q->fetchAll();
Now you have $result which is an array either of your data, or empty so you can solve your problem by saying:
if(count($result) < 1) {
//output an error message
} else {
//output your table
}
Now you have your solution, let's streamline the code a bit. Remember, programmers want DRY code, so we don't want to do the same query twice. Lets assume our result count was greater than 0 so we are inside our else block.
{
//get all the array keys from the first entry in the result. These are the column names from the database which we want to use for our headings
$headings = array_keys($result[0]);
//now we want to do the same thing to each element, i.e. wrap it in html tags so let's make use of array_walk. We use the & symbol to pass the values by reference so we can amend them
array_walk($headings, function(&$field, &$key) {
$field = <th>$field</th>
});
//so now we have an array of table headings, so lets quickly implode them, we don't want to write a whole loop for this
echo <tr> . implode('',$headings) . </tr>;
now you can do your original loop and just output the values hey presto, dryer simpler code! You could also try and experiment with array_walk_recursive and see if you can do the same to the values for your nested loop, after all you just want to wrap them in <td> tags!
Note, I've not tested this so code, but you should be able to use it pretty much as it is, just have a little play and experiment with it.
happy coding!