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6.13. Creating Dynamic Functions
6.13.2. Solution
Use create_function( ):
$add = create_function('$i,$j', 'return $i+$j;');
$add(1, 1); // returns 26.13.3. Discussion
The first parameter to create_function( ) is a string that contains the arguments for the function, and the second is the function body. Using create_function( ) is exceptionally slow, so if you can predefine the function, it's best to do so.
The most frequently used case of create_function( ) in action is to create custom sorting functions for usort( ) or array_walk( ):
// sort files in reverse natural order
usort($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.
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| 6.12. Accessing a Global Variable Inside a Function |  | 7. Classes and Objects |
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