它显示警告：mysql_fetch_array（）期望参数1是资源，在[重复]中给出布尔值

Question

This question already has an answer here:

• mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc… expects parameter 1 to be resource or result 32 answers

<?php       
    $Email = $_SESSION['Email'];
    $query="SELECT Title FROM registerations WHERE Email LIKE $Email";

    //echo $query;
    $res=mysql_query($query);
    //echo $result;
    //$Title="";

    while($row = mysql_fetch_array($res))
    {   //echo "inloop";
            echo $row['Title'];
    }
?>

This is showing the error:

Warning: mysql_fetch_array() expects parameter 1 to be resource, Boolean given in.

I don't understand what the mistake is.

</div>

Answer 1

Check if the result returns something before fetching it:

$res=mysql_query($query);
if($res=== FALSE) { 
    die(mysql_error()); // TODO: better error handling
}