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get this error code


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Fairly new to PHP and have the following code which should simply output into 3 columns - I have checked the query which does work - so I dont understand why I get this error

mysql_fetch_array() expects parameter 1 to be resource,


// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);

$sql = “SELECT * FROM duration_matched WHERE groupm = '”.$coincidence ."’";
$result = $conn->query($sql);

// set up loop counter
$col_count = 0;

// start table and first tr
echo ‘


while ($row=mysql_fetch_array($result)) {
// if you have output 3 cols then end tr and start a new one
if ($col_count == 3) {
echo ‘

// and reset the col count
$col_count = 0;

// always output the td
echo ‘

// and count the column

// then close off the last row and the table
echo ‘

’ . $row[‘image’] . ‘



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