(PHP 7 >= 7.2.0, PHP 8)
ReflectionClass::isIterable — Check whether this class is iterable
Check whether this class is iterable (i.e. can be used inside foreach).
This function has no parameters.
Returns true on success or false on failure.
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);
}
?>
The above example will output:
Is ArrayObject iterable? bool(true) Is IteratorClass iterable? bool(true) Is DerivedClass iterable? bool(true) Is NonIterator iterable? bool(false)