ReflectionClass::isIterable()
(PHP 7 >= 7.2.0)
Check whether this class is iterable
说明
public ReflectionClass::isIterable(void): bool
Check whether this class is iterable (i.e. can be used insideforeach).
参数
此函数没有参数。
返回值
成功时返回TRUE
,或者在失败时返回FALSE
。
范例
BasicReflectionClass::isIterable()Usage
<?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_iterable($class) { $reflection = new ReflectionClass($class); var_dump($reflection->isIterable()); } $classes = array("ArrayObject", "IteratorClass", "DerivedClass", "NonIterator"); foreach ($classes as $class) { echo "Is $class iterable? "; dump_iterable($class); } ?>
以上例程会输出:
Is ArrayObject iterable? bool(true) Is IteratorClass iterable? bool(true) Is DerivedClass iterable? bool(true) Is NonIterator iterable? bool(false)
参见
- ReflectionClass::__construct() 初始化 ReflectionClass 类