func_num_args

(PHP 4, PHP 5, PHP 7, PHP 8)

func_num_argsReturns the number of arguments passed to the function

Descrizione

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.

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

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

Errori/Eccezioni

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

Esempi

Example #1 func_num_args() example

<?php
function foo()
{
echo
"Number of arguments: ", func_num_args(), PHP_EOL;
}

foo(1, 2, 3);
?>

Il precedente esempio visualizzerà:

Number of arguments: 3

Note

Nota:

As of PHP 8.0.0, the func_*() family of functions is intended to be mostly transparent with regard to named arguments, by treating the arguments as if they were all passed positionally, and missing arguments are replaced with their defaults. This function ignores the collection of unknown named variadic arguments. Unknown named arguments which are collected can only be accessed through the variadic parameter.

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