Countable::count
(PHP 5 >= 5.1.0)
Countable::count — Count elements of an object
Description
abstract public int Countable::count
([ int
$mode = COUNT_NORMAL
] )This method is executed when using the count() function on an object implementing Countable.
Parameters
-
mode -
The optional
modeparameter will be set toCOUNT_NORMALorCOUNT_RECURSIVE, depending on what value was passed to the second parameter of count(). This is particularly useful for counting all the elements of a multidimensional array/Countable combination.
Changelog
| Version | Description |
|---|---|
| 5.6.0 |
The optional mode parameter was added.
|
Examples
Example #1 Countable::count() example
<?php
class myCounter implements Countable {
private $count = 0;
public function count() {
return ++$this->count;
}
}
$counter = new myCounter;
for($i=0; $i<10; ++$i) {
echo "I have been count()ed " . count($counter) . " times\n";
}
?>
The above example will output something similar to:
I have been count()ed 1 times I have been count()ed 2 times I have been count()ed 3 times I have been count()ed 4 times I have been count()ed 5 times I have been count()ed 6 times I have been count()ed 7 times I have been count()ed 8 times I have been count()ed 9 times I have been count()ed 10 times
Коментарии
Even though Countable::count method is called when the object implementing Countable is used in count() function, the second parameter of count, $mode, has no influence to your class method.
$mode is not passed to Countable::count:
<?php
class Foo implements Countable
{
public function count()
{
var_dump(func_get_args());
return 1;
}
}
count(new Foo(), COUNT_RECURSIVE);
?>
var_dump output:
array(0) {
}