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PHP func_num_args

PHP original manual for func_num_args [ show | php.net ]


(PHP 4, PHP 5, PHP 7)

func_num_argsReturns the number of arguments passed to the function


int func_num_args ( void )

Gets the number of arguments passed to the function.

This function may be used in conjunction with func_get_arg() and func_get_args() 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.


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 calling include or require from within a function in the calling file, it now generates a warning and returns -1.


Generates a warning if called from outside of a user-defined function.


Example #1 func_num_args() example

function foo()
$numargs func_num_args();
"Number of arguments: $numargs\n";


The above example will output:

Number of arguments: 3

Example #2 func_num_args() example before and after PHP 5.3

function foo() {

foo('First arg''Second arg');




Output previous to PHP 5.3:


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



Because this function depends on the current scope to determine parameter details, it cannot be used as a function parameter in versions 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.