Why Am I Getting the 'Trying to Get Property of Non-Object' Error in PHP?

Trying to Get Property of Non-Object in PHP: A Detailed Explanation

In PHP, encountering the "Trying to get property of non-object" error message can be perplexing. To delve into the cause and resolution of this error, let's analyze the provided code snippets:

// Control page
$results = mysql_query(...);
$sidemenus = mysql_fetch_object($results);

// View page
foreach ($sidemenus as $sidemenu) {
    echo $sidemenu->mname."<br />";
}

The issue arises because mysql_fetch_object() returns a single object representing the first row of the result set, whereas the loop in the View page treats $sidemenus as an array and attempts to access its elements as objects.

// Fix
$results = mysql_query(...);

$sidemenus = array();
while ($sidemenu = mysql_fetch_object($results)) {
    $sidemenus[] = $sidemenu;
}

This revised code initializes $sidemenus as an array and iterates over the result set, adding each object to the array. Subsequently, the View page can safely loop over $sidemenus as an array of objects.

Alternatively, for more efficient database handling, consider switching to PDO (PHP Data Objects). PDOStatement::fetchAll(PDO::FETCH_OBJ) provides a similar functionality, but with improved performance and security.

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