How to get no of arguments passed to a PHP Function?

PHP - Interview Questions

func_get_args() function is used to get number of arguments passed in a PHP function.

Example :

function foo() {
   return  func_get_args();
}
echo foo(1,5,7,3);//output 4;
echo foo(a,b);//output 2;
echo foo();//output 0;

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