Returns the number of arguments passed into the current user-defined function. func_num_args() will generate a warning if called from outside of a function definition.
<?php
function foo() {
$numargs = func_num_args();
echo "Number of arguments: $numargs\n";
}
foo (1, 2, 3); // Prints 'Number of arguments: 3'
?>
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func_num_args() may be used in conjunction with func_get_arg() and func_get_args() to allow user-defined functions to accept variable-length argument lists.
Note: This function was added in PHP 4.