Ibu Ibu - 7 months ago 55
PHP Question

Using usort in php with a class private function

ok using usort with a function is not so complicated

This is what i had before in my linear code

function merchantSort($a,$b){
return ....// stuff;
}

$array = array('..','..','..');


to sort i simply do

usort($array,"merchantSort");


Now we are upgrading the code and removing all global functions and putting them in their appropriate place. Now all the code is in a class and i can't figure out how to use the usort function to sort the array with the parameter that is an object method instead of a simple function

class ClassName {
...

private function merchantSort($a,$b) {
return ...// the sort
}

public function doSomeWork() {
...
$array = $this->someThingThatReturnAnArray();
usort($array,'$this->merchantSort'); // ??? this is the part i can't figure out
...

}
}


The question is how do i call an object method inside the usort() function

Answer

Make your sort function static:

private static function merchantSort($a,$b) {
       return ...// the sort
}

And use an array for the second parameter:

$array = $this->someThingThatReturnAnArray();
usort($array, array('ClassName','merchantSort'));