You may already know that PHP allows you to
define functions with optional arguments. But there
is also a method for allowing completely arbitrary
number of function arguments. First, here is an example with just optional
arguments: // function with 2 optional arguments
function foo($arg1 = '', $arg2 = '') { echo "arg1: $arg1\n";
echo "arg2: $arg2\n"; } foo('hello','world');
/* prints:
arg1: hello
arg2: world
*/ foo();
/* prints:
arg1:
arg2:
*/ Now, let's see how we can build a function that
accepts any number of arguments. This time we are
going to utilize func_get_args(): // yes, the argument list can be empty
function foo() { // returns an array of all passed arguments $args = func_get_args(); foreach ($args as $k => $v) { echo "arg".($k+1).": $v\n"; } } foo();
/* prints nothing */ foo('hello');
/* prints
arg1: hello
*/ foo('hello', 'world', 'again');
/* prints
arg1: hello
arg2: world
arg3: again
*/
