How can PHP developers effectively debug issues related to queries returning non-objects and errors like "Trying to get property of non-object" in their code?

When queries return non-objects in PHP, it often results in errors like "Trying to get property of non-object" when trying to access properties of the result. To effectively debug this issue, developers should check if the query is returning a valid object before trying to access its properties. This can be done by using conditional statements to ensure that the object is not null or false before accessing its properties. 

// Example code snippet to check if query result is an object before accessing its properties
$result = $db->query("SELECT * FROM users WHERE id = 1");

if($result && $result->num_rows > 0) {
    // Fetch the data and access properties
    $row = $result->fetch_assoc();
    echo $row['username'];
} else {
    echo "No user found with that ID.";
}

Keywords

PHP debugging queries non-object error

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