[UPHPU] pass variables into a function

[Kevin Carter]

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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