I am trying to create a PHP function that takes another PHP function as input. Here is an example:
function getMean(function){
$allUsers = getAllUsers();
$sum = 0;
foreach ($allUsers as $currentUser ){
$sum =+ (function($currentUser['CONSUMER_ID'], 5, 8))/(8-5);
}
}
Perhaps something like this should do it. PHP has a "type" called callback, which can be a closure (as of PHP 5.3), name of a function or array containing object and the method to call. These callbacks can be called with call_user_func()
function getMean($callback){
$allUsers = getAllUsers();
$sum = 0;
foreach ($allUsers as $currentUser ){
$sum =+ (call_user_func($callback, $currentUser['CONSUMER_ID'], 5, 8))/(8-5);
}
return $sum;
}
is_callable($callback).You need PHP 5.3 to do that natively.
function getMean($function){
$allUsers = getAllUsers();
$sum = 0;
foreach ($allUsers as $currentUser ){
$sum += ($function($currentUser['CONSUMER_ID'], 5, 8))/(8-5);
}
return $sum;
}
getMean(function($consumer_id, $five, $eight) {
return $consumer_id;
});
I you run PHP 5.3- (lower than 5.3), you need to use a callback (documentation is here) along with the call_user_func() or call_user_func_array() function.
you can do that as long as function($currentUser['CONSUMER_ID'], 5, 8) returns something
It looks like the PHP Eval function is what you are looking for. Pass the getMean function a string, and then change the line to have $sum =+ (eval($param) .....)
Security is a problem though because any function can be passed.
Save the function as a variable.
$function = function($param1){ //code here }
and pass it to your other function as a parameter.
function getMean($function)
{
//code here
$sum += $function($param);
}
[edit]
If you want to dynamically create a function in php < 5.3 then youre stuck with using create_function. Becuase of how you use this function its really insane to use it for anything but but creating simple function for array_map,array_walk or things that do simple calculations or basic text processing.
If youre doing anything more complex than that its much easier and less of a headache to simply define the function as normal and then use it with call_user_func or call_user_func_array as others have suggested.
DO NOT USE eval :-)
