Ruler is a simple stateless production rules engine for PHP 5.3.
Ruler uses a pretty straightforward DSL provided by the RuleBuilder:
<?php
$rb = new RuleBuilder();
$rule = $rb->create(
$rb->logicalAnd(
$rb['minNumPeople']->lessThanOrEqualTo($rb['actualNumPeople']),
$rb['maxNumPeople']->greaterThanOrEqualTo($rb['actualNumPeople'])
),
function() {
echo 'YAY!';
}
);
$context = new Context(array(
'minNumPeople' => 5,
'maxNumPeople' => 25,
'actualNumPeople' => function() {
return 6;
},
));
$rule->execute($context);Of course, if you're not into the whole brevity thing, you can use it without a RuleBuilder:
<?php
$actualNumPeople = new Variable('actualNumPeople');
$rule = new Rule(
new Operator\LogicalAnd(array(
new Operator\LessThanOrEqualTo(new Variable('minNumPeople'), $actualNumPeople),
new Operator\GreaterThanOrEqualTo(new Variable('maxNumPeople'), $actualNumPeople)
)),
function() {
echo 'YAY!';
}
);
$context = new Context(array(
'minNumPeople' => 5,
'maxNumPeople' => 25,
'actualNumPeople' => function() {
return 6;
},
));
$rule->execute($context)