PHP allows you to call function by value and reference both. In case of PHP call

In case of PHP call by reference, actual value is modified if it is modified inside

PHP allows you to define C++ style default argument values. In such case, if you don't

PHP Parameterized functions are the functions with parameters. You can pass any number of parameters inside

Magic constants are the predefined constants in PHP which get changed on the basis of their

Exceptions are used to change the normal flow of a script if a specified error occurs.