Recipe 6.13 Creating Dynamic Functions
6.13.1 Problem
You want to create and define a
function as your program is running.
6.13.2 Solution
Use create_function( ):
$add = create_function('$i,$j', 'return $i+$j;');
$add(1, 1); // returns 2
6.13.3 Discussion
The first parameter to create_function(
) is a string that contains the arguments for
the function, and the second is the function body. Using
create_function( ) is exceptionally slow, so if
you can predefine the function, it's best to do so.
The most frequently used case of create_function(
) in action is to create custom sorting functions for
usort( ) or array_walk( ):
// sort files in reverse natural order
usort($files, create_function('$a, $b', 'return strnatcmp($b, $a);'));
6.13.4 See Also
Recipe 4.18 for information on
usort( ); documentation on
create_function( ) at
http://www.php.net/create-function and on
usort( ) at
http://www.php.net/usort.
|
