(PHP 5, PHP 7, PHP 8)
ReflectionClass::isIterateable — 检查是否可迭代（iterateable）
检查一个类是否可迭代（iterateable）。
此函数没有参数。
成功时返回 true， 或者在失败时返回 false。
示例 #1 ReflectionClass::isIterateable() 例子
<?php
class IteratorClass implements Iterator {
public function __construct() { }
public function key() { }
public function current() { }
function next() { }
function valid() { }
function rewind() { }
}
class DerivedClass extends IteratorClass { }
class NonIterator { }
function dump_iterateable($class) {
$reflection = new ReflectionClass($class);
var_dump($reflection->isIterateable());
}
$classes = array("ArrayObject", "IteratorClass", "DerivedClass", "NonIterator");
foreach ($classes as $class) {
echo "Is $class iterateable? ";
dump_iterateable($class);
}
?>
以上例程会输出：
Is ArrayObject iterateable? bool(true) Is IteratorClass iterateable? bool(true) Is DerivedClass iterateable? bool(true) Is NonIterator iterateable? bool(false)