What is the significance of the error message "Call to a member function query() on a non-object" in PHP object-oriented programming?

The error message "Call to a member function query() on a non-object" in PHP object-oriented programming indicates that a method is being called on a variable that is not an object. This often occurs when trying to call a method on a variable that has not been properly initialized or instantiated as an object. To solve this issue, make sure that the variable is properly initialized as an object before calling any methods on it. 

// Incorrect code causing the error
$pdo = null;
$result = $pdo->query("SELECT * FROM table");

// Corrected code
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");
$result = $pdo->query("SELECT * FROM table");

Keywords

PHP object-oriented programming error message query() non-object

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