@ 2013-12-05T20:58:59Z <?php
class MapIterator implements IteratorAggregate {
private $f;
private $inner;
public function __construct($f, $inner) {
$this->f = $f;
$this->inner = $inner;
}
function current() {
return call_user_func($this->f, $this->inner->current());
}
function getIterator()
{
return $this->inner;
}
}
function iter_map($f, $iter) {
return new MapIterator($f, $iter);
}
// example:
function times_two($x) {
return $x * 2;
}
$source = new ArrayIterator([0, 1, 2, 3, 4, 5, 6]);
print_r(iterator_to_array(iter_map('times_two', $source)));
//print_r(iterator_to_array(gen_map('times_two', $source)));
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Output for 8.1.0 - 8.1.27 , 8.2.0 - 8.2.17 , 8.3.0 - 8.3.4 Deprecated: Return type of MapIterator::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/L57BS on line 16
Array
(
[0] => 0
[1] => 1
[2] => 2
[3] => 3
[4] => 4
[5] => 5
[6] => 6
)
Output for 5.4.0 - 5.4.45 , 5.5.0 - 5.5.37 , 5.6.0 - 5.6.28 , 7.0.0 - 7.0.20 , 7.1.0 - 7.1.10 , 7.2.0 - 7.2.33 , 7.3.12 - 7.3.33 , 7.4.0 - 7.4.33 , 8.0.0 - 8.0.30 Array
(
[0] => 0
[1] => 1
[2] => 2
[3] => 3
[4] => 4
[5] => 5
[6] => 6
)
Output for 5.1.0 - 5.1.6 , 5.2.0 - 5.2.17 , 5.3.0 - 5.3.29 Parse error: syntax error, unexpected '[', expecting ')' in /in/L57BS on line 33
Process exited with code 255 . Output for 5.0.0 - 5.0.5 Parse error: parse error, unexpected '[', expecting ')' in /in/L57BS on line 33
Process exited with code 255 . Output for 4.4.2 - 4.4.9 Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/L57BS on line 3
Process exited with code 255 . Output for 4.3.0 - 4.3.1 , 4.3.5 - 4.3.11 , 4.4.0 - 4.4.1 Parse error: parse error, unexpected T_STRING, expecting '{' in /in/L57BS on line 3
Process exited with code 255 . Output for 4.3.2 - 4.3.4 Parse error: parse error, expecting `'{'' in /in/L57BS on line 3
Process exited with code 255 . preferences:dark mode live preview
229.95 ms | 401 KiB | 346 Q