What are some common causes for the PHP error "Call to a member function on a non-object"?

The PHP error "Call to a member function on a non-object" occurs when you try to call a method on a variable that is not an object. This can happen if the variable is not initialized properly or if it was set to null. To solve this issue, make sure that the variable is assigned an object before calling any methods on it. 

// Incorrect code that may cause "Call to a member function on a non-object" error
$variable = null;
$variable->someMethod(); // Error: Call to a member function on a non-object

// Correct way to fix the issue
$object = new SomeClass();
$object->someMethod(); // This will work correctly without any error

Keywords

PHP error Call to a member function non-object object-oriented programming debugging

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