hoa math condition functions

gistfile1.php

// defining hoa functions
'if'      => xcallable(function($condition, $than, $else) {
                return $condition ? $than : $else;
             }),
'lt'      => xcallable(function($left, $right) {
                return $left < $right;
             }),
'gt'      => xcallable(function($left, $right) {
                return $left > $right;
             }),
'eq'      => xcallable(function($left, $right) {
                return $left == $right;
             })