php man page for func_num_args

FUNC_NUM_ARGS(3)							 1							  FUNC_NUM_ARGS(3)

func_num_args - Returns the number of arguments passed to the function

SYNOPSIS
       int func_num_args (void	)

DESCRIPTION
	Gets the number of arguments passed to the function.

	This  function	may  be  used in conjunction with func_get_arg(3) and func_get_args(3) to allow user-defined functions to accept variable-
       length argument lists.

RETURN VALUES
	Returns the number of arguments passed into the current user-defined function.

CHANGELOG
       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.3.0	|						    |
       |	|						    |
       |	|  This function  can  now  be	used  in  parameter |
       |	| lists.					    |
       |	|						    |
       | 5.3.0	|						    |
       |	|						    |
       |	|  If  this  function  is called from the outermost |
       |	| scope of a file which has been included by  call- |
       |	| ing  include(3) or require(3) from within a func- |
       |	| tion in the calling  file,  it  now  generates  a |
       |	| warning and returns -1.			    |
       |	|						    |
       +--------+---------------------------------------------------+
ERRORS
/EXCEPTIONS
	Generates a warning if called from outside of a user-defined function.

EXAMPLES
       Example #1

	      func_num_args(3) example

	      <?php
	      function foo()
	      {
		  $numargs = func_num_args();
		  echo "Number of arguments: $numargs
";
	      }

	      foo(1, 2, 3);
	      ?>

	      The above example will output:

	      Number of arguments: 3

       Example #2

	      func_num_args(3) example before and after PHP 5.3

	      test.php
	      <?php
	      function foo() {
		  include './fna.php';
	      }

	      foo('First arg', 'Second arg');
	      ?>

	      fna.php
	      <?php

	      $num_args = func_num_args();
	      var_export($num_args);

	      ?>

	       Output previous to PHP 5.3:

	      2

	       Output in PHP 5.3 and later will be something similar to:

	      Warning: func_num_args():  Called from the global scope - no function
	      context in /home/torben/Desktop/code/ml/fna.php on line 3
	      -1

NOTES
       Note

	      Because this function depends on the current scope to determine parameter details, it cannot be used as a function parameter in ver-
	      sions prior to 5.3.0. If this value must be passed, the results should be assigned to  a	variable,  and	that  variable	should	be
	      passed.

SEE ALSO
       ... syntax in PHP 5.6+, func_get_arg(3), func_get_args(3), ReflectionFunctionAbstract::getNumberOfParameters.

PHP Documentation Group 													  FUNC_NUM_ARGS(3)