func_num_args(3) [php man page]

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)

Check Out this Related Man Page

DEBUG_PRINT_BACKTRACE(3)						 1						  DEBUG_PRINT_BACKTRACE(3)

debug_print_backtrace - Prints a backtrace

SYNOPSIS

       void debug_print_backtrace ([int  $options], [int  $limit])

DESCRIPTION

       debug_print_backtrace(3) prints a PHP backtrace. It prints the function calls, included/required files and eval(3)ed stuff.

PARAMETERS

	      o $options
		- As of 5.3.6, this parameter is a bitmask for the following options:

	      debug_print_backtrace(3) options

	      +----------------------------+---------------------------------------------------+
	      |DEBUG_BACKTRACE_IGNORE_ARGS |						       |
	      | 			   |						       |
	      | 			   |  Whether  or  not	to  omit the "args" index, and |
	      | 			   | thus all the function/method arguments,  to  save |
	      | 			   | memory.					       |
	      | 			   |						       |
	      +----------------------------+---------------------------------------------------+
	      o $limit
		-  As of 5.4.0, this parameter can be used to limit the number of stack frames printed. By default ($limit= 0) it prints all stack
		frames.

RETURN VALUES

	No value is returned.

CHANGELOG

       +--------+-----------------------------------------+
       |Version |					  |
       |	|					  |
       |	|		Description		  |
       |	|					  |
       +--------+-----------------------------------------+
       | 5.4.0	|					  |
       |	|					  |
       |	|   Added the optional parameter $limit.  |
       |	|					  |
       | 5.3.6	|					  |
       |	|					  |
       |	|  Added the optional parameter $options. |
       |	|					  |
       +--------+-----------------------------------------+
EXAMPLES

       Example #1

	      debug_print_backtrace(3) example

	      <?php
	      // include.php file

	      function a() {
		  b();
	      }

	      function b() {
		  c();
	      }

	      function c(){
		  debug_print_backtrace();
	      }

	      a();

	      ?>

	      <?php
	      // test.php file
	      // this is the file you should run

	      include 'include.php';
	      ?>

	      The above example will output something similar to:

	      #0  c() called at [/tmp/include.php:10]
	      #1  b() called at [/tmp/include.php:6]
	      #2  a() called at [/tmp/include.php:17]
	      #3  include(/tmp/include.php) called at [/tmp/test.php:3]

SEE ALSO

       debug_backtrace(3).

PHP Documentation Group 												  DEBUG_PRINT_BACKTRACE(3)

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func_num_args(3) [php man page]

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