ReflectionClass::isIterable()

(PHP 7 >= 7.2.0)

Check whether this class is iterable

说明

publicReflectionClass::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