Php/docs/function.func-num-args
func_num_args
(PHP 4, PHP 5, PHP 7)
func_num_args — Returns the number of arguments passed to the function
Description
func_num_args ( ) : int
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.
Errors/Exceptions
Generates a warning if called from outside of a user-defined function.
Examples
Example #1 func_num_args() example
<?phpfunction foo(){ $numargs = func_num_args(); echo "Number of arguments: $numargs\n";}foo(1, 2, 3); ?>
The above example will output:
Number of arguments: 3
Example #2 func_num_args() example before and after PHP 5.3
test.php<?phpfunction foo() { include './fna.php';}foo('First arg', 'Second arg');?>fna.php<?php$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 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.