function do_something_awesome($params = array()) {
$default = array(
'a' => 'a',
'b' => 'b',
);
$params = array_merge($default, $params);
....
}
Lamont Peterson wrote:
On Saturday 10 January 2009 08:14:20 am Walt Haas wrote:
The usual approach would be to write
function do_something_awesome( $params = array() )
{
if ( array_key_exists( 'a', $params ) ) {
$param_a = $params( 'a' );
} else {
$param_a = 'a';
}
if ( array_key_exists( 'b', $params ) ) {
$param_b = $params( 'b' );
} else {
$param_b = 'b';
}
}
Then you can write calls like
do_something_awesome( );
do_something_awesome( array( 'a' => 'foo' ) );
do_something_awesome( array( 'b' => 'bar' ) );
do_something_awesome( array( 'a' => 'foo', 'b' => 'bar' ) );
Here's a variation on Walt's approach:
function do_something_awesome ($parameters = array ())
{
$default_parameters = array (
'a' => 'a',
'b' => 'b');
foreach ($parameters as $parameter => $value)
{
$default_parameters[$parameter] = $value;
}
$parameters = $default_parameters;
unset ($default_parameters;
// Do awesome stuff.
}
I'll you figure out why I wrote this example to loop through the passed in
parameters instead of the defaults :) .
Another thing you could do is to create a process_passed_parameters_array ()
function. Basically, take the foreach loop, put it in the function and have
it take the list of defaults and the parameters that were passed in:
function process_passed_parameters_array ($defaults, $parameters)
{
foreach ($parameters as $parameter => $value)
{
if (array_key_exists ($parameter, $defaults)
{
$defaults[$parameter] = $value;
}
else
{
// We don't want to allow parameters that are
// not in the defaults list. You could extend
// this code to throw an exception, if preferred.
}
}
return $defaults;
}
Then, you can call it:
function do_something_awesome ($parameters = array ())
{
$parameters = process_passed_parameters_array (array ('a' => 'a', 'b'
=> 'b', 'c' => ''), $parameters)
// Do awesome stuff.
}
This could easily be extended to require some parameters.
Still, I also like the func_num_args () approach for some situations.
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