(PHP 5 >= 5.1.0, PHP 7, PHP 8)
Countable::count — 統計一個(gè)對象的元素個(gè)數
當使用 count()函數作用于一個(gè)實(shí)現了 Countable的對象時(shí)這個(gè)方法會(huì )被執行.
此函數沒(méi)有參數。
The custom count as an integer.
注意:
The return value is cast to an integer.
示例 #1 Countable::count() example
<?php
class myCounter implements Countable {
public function count() {
static $count = 0;
return ++$count;
}
}
$counter = new myCounter;
for($i=0; $i<10; ++$i) {
echo "I have been count()ed " . count($counter) . " times\n";
}
?>
以上例程的輸出類(lèi)似于：
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