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ReflectionClass::isIterable

(PHP 7 >= 7.2.0)

ReflectionClass::isIterableCheck whether this class is iterable

说明

public ReflectionClass::isIterable ( void ) : 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

Example #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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