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ReflectionClass::isIterable

(PHP 7 >= 7.2.0, PHP 8)

ReflectionClass::isIterableCheck whether this class is iterable

说明

public ReflectionClass::isIterable(): bool

Check whether this class is iterable (i.e. can be used inside foreach).

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

示例 #1 Basic ReflectionClass::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)

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