It's by value according to the PHP Documentation. By default, function arguments are So, if I use call by reference then, will there be some performance wise benefit??? (keeping the array values unchanged during the whole. What's the difference between call by value & call by reference in PHP? This is the most important concept used in programming and sometime. Another difficult part to understand is how values can change, or not change, depending on PHP. $Variable_Value = 10;. print "Before the function call = ". The important one is After the function call. Object variables are still passed by value, its just the value that is passed in PHP5 is a reference handle. Man kann leicht dem Trugschluss anheim fallen, dass diese Einführung generell gilt. On the other hand, it's also exactly what you'd expect if an object handle was passed to the function, which is actually what happens. The called function uses the value in a local variable; any changes to it do not affect the source variable. First number 5 Second number 7. As an example, change your code to this:. This tells PHP that you want to make changes to the original, and don't just want a copy. How To Upload Records From Excel File to Database Using Stored Procedure In MVC. This simply means that it is available in all scopes throughout a script. Variables are passed by value by default! Variables containing objects are passed by reference. Each month, over 50 million developers come to Stack Overflow to learn, share their knowledge, and build their careers. You can pass a variable by reference to a function so the function can modify the variable. Original geschrieben von derwebling Aber der Unterschied zwischen Methode 2 und 3 ist mir noch nicht ganz klar. If we are talking about readability and perception, then the receiving method needs to show that the object coming in is a baden baden germany tripadvisor, not an object instance, otherwise the reader is perplexed why the object is not returned. Wird doch nur die Referenz kopiert. Moment, das ist doch ein krasser Fehler. So its better to pass variables by value by considering time of execution. Stack Overflow Questions Developer Jobs Documentation beta Tags Users. On the other hand, it's also exactly what you'd expect if an object handle was passed to the function, which is actually what happens. It seems a lot of people get confused by the way objects are passed to functions and what pass by reference means.