<?php
function sum($carry, $item)
{
$carry += $item;
return $carry;
}
function sub($carry, $item)
{
$carry -= $item;
return $carry;
}
function foo2($mass, $func){
};
echo foo2($arr2, "sub");
echo "\n";
echo foo2($arr2, "sum");
PD9waHAKCiRhcnIyID0gYXJyYXkoMSwyLDMsNCk7CgpmdW5jdGlvbiBzdW0oJGNhcnJ5LCAkaXRlbSkKewogICAgJGNhcnJ5ICs9ICRpdGVtOwogICAgcmV0dXJuICRjYXJyeTsKfQoKZnVuY3Rpb24gc3ViKCRjYXJyeSwgJGl0ZW0pCnsKICAgICRjYXJyeSAtPSAkaXRlbTsKICAgIHJldHVybiAkY2Fycnk7Cn0KCmZ1bmN0aW9uIGZvbzIoJG1hc3MsICRmdW5jKXsKCSRyZXMgPSBhcnJheV9yZWR1Y2UoJG1hc3MsICRmdW5jLCAkbWFzc1swXSk7CgkKICAgIHJldHVybiBjYWxsX3VzZXJfZnVuYygkZnVuYywgJHJlcywgLSRtYXNzWzBdKTsKfTsKCmVjaG8gZm9vMigkYXJyMiwgInN1YiIpOwplY2hvICJcbiI7CmVjaG8gZm9vMigkYXJyMiwgInN1bSIpOw==