Objective interface
Objective interface
Objective interface
The objective interface provides an
object-oriented way to access the extended interfaces. The
following example shows how the above one would be implemented
using the objective interface. The output of this example is
exactly the same, except that instead of printing “Not a valid
counter!”, this will instead issue a PHP warning that the variable
$counter_three is not an object. This example shows that
it is possible to subclass the Counter class defined by the extension, as
well as that the counter’s value is maintained using an instance
variable rather than method access.
Example #1 “counter”‘s objective interface
<?php
class MyCounter extends Counter
{
public function printCounterInfo() {
printf("Counter's name is '%s' and is%s persistent. Its current value is %d.\n",
$this->getMeta(COUNTER_META_NAME),
$this->getMeta(COUNTER_META_IS_PERSISTENT) ? '' : ' not',
$this->value);
}
}
Counter::setCounterClass("MyCounter");
if (($counter_one = Counter::getNamed("one")) === NULL) {
$counter_one = new Counter("one", 0, COUNTER_FLAG_PERSIST);
}
$counter_one->bumpValue(2); // we aren't allowed to "set" the value directly
$counter_two = new Counter("two", 5);
$counter_three = Counter::getNamed("three");
$counter_four = new Counter("four", 2, COUNTER_FLAG_PERSIST | COUNTER_FLAG_SAVE | COUNTER_FLAG_NO_OVERWRITE);
$counter_four->bumpValue(1);
$counter_one->printCounterInfo();
$counter_two->printCounterInfo();
$counter_three->printCounterInfo();
$counter_four->printCounterInfo();
?>