sql query fetch error [duplicate] - php

Question

This question already has answers here:
Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?
(3 answers)
Closed 3 years ago.
I'v got some code but keep getting error's also I'm new to php so any help would be great :)
Here's my code
<?php
// Create connection
$con = mysqli_connect("host","database","pswd");
// Database Connection Check
if (mysqli_connect_errno($con)) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
break;
}
echo "<table>";
echo nextweek("heren1kalender","Heren 1e Provinciale");
echo "</table>";
function nextweek($table, $ploegNaam) {
// Get this weeks dates (monday and sunday and month)
$current_day = date("N")
$days_to_sunday = 7 - $current_day;
$days_from_monday = $current_day - 1;
$monday = date("d", strtotime("- {$days_from_monday} Days"));
$sunday = date("d", strtotime("+ {$days_to_sunday} Days"));
$month = date("m", strtotime("+ {$days_to_sunday} Days"));
// SQL query
$result = mysqli_query($con,"SELECT datum, hoofd, thuisploeg, bezoekers FROM " . $table . " WHERE thuisploeg LIKE '%Lochristi%' OR bezoekers LIKE '%Lochristi%'");
while($row = mysqli_fetch_array($result)) {
$string ="";
// Get day and month from array
$dag = substr($row['datum'], 4, -6);
$maand = substr($row['datum'], 7, -3);
if ($dag >= $monday AND $dag <= $sunday AND $maand == $month) {
if (strpos($row['thuisploeg'],'Lochristi') !== false) {
$string .= "<tr>";
if (substr($row['hoofd'], 0, 1) >= 3) {
$string .= '<td class="win">' . $row['hoofd'] . "</td>";
}
else {
$string .= '<td class="loss">' . $row['hoofd'] . "</td>";
}
$string .= '<td>' . $ploegNaam . '</td>';
$string .= "<td><strong>VS</strong></td>";
$string .= '<td>' . $row['bezoekers'] . '</td>';
}
elseif (strpos($row['bezoekers'],'Lochristi') !== false) {
$string .= "<tr>";
if (substr($row['hoofd'], 0, 1) >= 3) {
$string .= '<td class="loss">' . $row['hoofd'] . "</td>";
}
else {
$string .= '<td class="win">' . $row['hoofd'] . "</td>";
}
$string .= '<td>' . $row['thuisploeg'] . '</td>';
$string .= "<td><strong>VS</strong></td>";
$string .= '<td>' . $ploegNaam . '</td>';
}
$string .= "</tr>";
}
}
return $string;
}
?>
And these are the PHP error's I'm getting:
Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /home/a2902119/public_html/test.php on line 24
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, null given in /home/a2902119/public_html/test.php on line 26
Thanks for the help!

Answer 1

After fixing the other issues: Variable scope. $con is not available in the functions. Pass it in as an arg or rework into classes or something.

Answer 2

Your SQL connection doesn't seem correct.
It should have 4 parts.
$con=mysqli_connect(hostaddress,dbuser,dbpass,databasename);