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func_get_arg
Description
An item from an argument list; FALSE if func_get_arg() is called in global scope
func_get_arg() is used to retrieve a single argument from the list of arguments passed to a user-defined function. It allows the programmer to easily create functions that accept variable-length argument lists.
The argument retrieved is the argument present at the offset specified by argument_number . The argument list starts at 0. If the argument specified by argument_number doesn't exist, a warning is generated.
Note
Unlike most functions, func_get_arg() cannot always be used as an argument for some functions. It's better to assign the output of func_get_arg() to a variable and then use the variable as the argument for a function. The following example illustrates the fickleness of this behavior:
// Calling this function will generate a fatal error
function demo_one () {
return printf ('%s', func_get_arg (0));
}
demo_one ("Hi");
// Calling this function will not cause an error
function demo_two () {
printf (func_get_arg (0));
}
demo_two ("Hi");
Example
Example 380. Demonstrate how func_get_arg() works
function demo () {
$num_args = func_num_args ();
if ($num_args == 0) {
print "The function was passed no arguments.<br /><br />";
return;
}
print "The function was passed $num_args argument(s): <blockquote>";
for ($offset = 0; $offset < $num_args; ++$offset) {
$arg = func_get_arg($offset);
printf ('Argument %d (Offset %d): %s<br />', $offset +1, $offset, $arg);
}
print '</blockquote><br />';
}
demo ();
demo (''); // Empty argument
demo ('', '', '', '', '', ''); // Six empty arguments
demo ('Chili Peppers', 'Ancho', 'Chipolte', 'Habanero', 'Jalapeno', 'Serrano');