I am trying to use a variable to get a function in a extended class, this is what I want to do but I can't get it to work, Thanks for your help.
class topclass {
function mode() {
$mode = 'function()';
$class = new extendclass;
$class->$mode;
}
}
Don't include the brackets "()" in the $mode variable.
class topclass {
function mode() {
$mode = 'functionx';
$class = new extendclass;
$class->$mode();
}
}
You can also use a callback, which is an array tuple of the instance and a string naming the function. If the intended call is $foo->bar(), then the callback would be:
$callback = array($foo, 'bar');
Regular functions (not a method) and static methods are stored as plain strings:
// Function bar
$callback = 'bar';
// Static method 'bar' in class Foo
$callback = 'Foo::bar';
It is called with call_user_func or call_user_func_array, the second allowing parameters to be passed to the callback function:
// No parameters
call_user_func($callback);
// Parameters 'baz' and 'bat'
call_user_func_array($callback, array('baz', 'bat');
It may seem like this is unnecessary complication, but in many instances, you may want to be able to programmatically build a function call, or you may not know ahead of time how many parameters you will be passing to a function (some functions, such as array_merge and sprintf allow a variable number of parameters).
