Common PHP Errors and How to Fix Them
Browse all documented PHP errors with detailed explanations, root causes, and step-by-step fixes.
Route collection name collision between 'admin' and 'user' in Laravel framework
In Laravel, route names must be unique. If two route collections have the same name, it can lead to unexpected behavior …
Trying to get property 'username' of non-object in /var/www/html/user.php on lin
This error occurs when you're trying to access an object property, but the variable you're accessing is not an object. T…
Fatal error: Uncaught PDOException: SQLSTATE[HY093]: Invalid parameter number: p
This error occurs when PDO (PHP Data Objects) encounters an invalid parameter in a prepared statement. The parameter is …
syntax error, unexpected 'if' (T_IF), expecting ',' or ';' on line 10
This error occurs when PHP encounters a syntax that is not allowed in the current context. In this case, the 'if' statem…
Missing required parameter 'csrf_token' in /var/www/html/user.php on line 55
The CSRF (Cross-Site Request Forgery) token is a security measure to prevent malicious requests. This error occurs when …
Cannot send headers. Output started at /var/www/html/index.php:123
This error occurs when PHP tries to send HTTP headers after the output has already started. In PHP, headers must be sent…
Error: Call to a member function all() on null in /var/www/html/app/Models/User.
This error occurs when a method or property is called on a null object reference. In the context of a PHP framework, it …
Undefined property: stdClass::$username in /var/www/html/login.php on line 42
This error occurs when you try to access a property of an object that doesn't exist. In PHP, this can happen when you're…
Call to undefined method Illuminate\Routing\RouteCollection::getRouteToAction()
This error occurs when Laravel's route collection is unable to find a method to map a route to its corresponding control…
Cannot instantiate abstract class App\Controller\Admin\BaseAdminController becau
This error occurs when you try to instantiate an abstract class, which is a class that cannot be directly instantiated a…
Uncaught Illuminate\Database\QueryException with message 'SQLSTATE[23000]: Integ
This error occurs when attempting to insert a new record into a database table with a unique key constraint that is alre…
Call to a member function fetchAll() on null in /var/www/html/database.php on li
This error occurs when a developer tries to call a method on a null or non-object variable, which in this case is a resu…
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