PHP 5's new E_STRICT error setting issues a warning when you use deprecated features. Specifically, it complains when you:
Create objects without a class definition
Use a constructor named after the class instead of _ _construct( )
Use var instead of public
Use is_a( ) instead of instanceof
Copy an object instead of making a reference (requires zend.ze1_compatibility_mode to be On)
Statically invoke a nonstatic method
Refine the prototype of an inherited method other than _ _construct( )
Return a nonvariable by reference
Assign the object returned by new by reference
All of these features work in PHP 5, but you should slowly modify your code to stop using them. Here are a few examples:
This code automagically creates $person as an object without a class definition:
$person->name = 'Rasmus Lerdorf'; PHP Strict Standards: Creating default object from empty value
This Person class uses var instead of public (or, even better, private). It also defines two constructors:
class Person { var $name; function _ _construct($name) { $this->name = $name; } function Person($name) { $this->name = $name; } } PHP Strict Standards: var: Deprecated. Please use the public/private/protected modifiers PHP Strict Standards: Redefining already defined constructor for class Person
E_STRICT is not enabled by default, nor is it part of E_ALL. To enable it, set your error_reporting configuration directive to E_ALL | E_STRICT. Setting E_STRICT within a PHP script using error_reporting( ) causes PHP to miss some errors because it has already parsed the file.