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run code in 150+ php & hhvm versions
Bugs & Features
<?php class IncrementIterator implements Iterator { protected $start; protected $end; protected $current; public function __construct($start, $end) { $this->start = $start; $this->end = $end; } public function rewind() { $this->current = $this->start; } public function valid() { return $this->current <= $this->end; } public function key() { return $this->current; } public function current() { return $this->current; } public function next() { $this->current++; } } class NestedIterator implements Iterator { protected $iterators = array(); protected $lastIndex = -1; protected $iteration = 0; public function addIterator(Iterator $it) { $this->iterators[] = $it; $this->lastIndex++; } public function rewind() { foreach ($this->iterators as $it) { $it->rewind(); } $this->iteration = 0; } public function valid() { return $this->lastIndex >= 0 && $this->iterators[0]->valid(); } public function key() { return $this->iteration; } public function current() { $return = array(); foreach ($this->iterators as $it) { $return[] = $it->current(); } return $return; } public function next() { for ($i = $this->lastIndex; $i >= 0; $i--) { $this->iterators[$i]->next(); if (!$this->iterators[$i]->valid()) { continue; } for ($j = $i + 1; $j <= $this->lastIndex; $j++) { $this->iterators[$j]->rewind(); } } } } $nestedIterator = new NestedIterator(); $nestedIterator->addIterator(new IncrementIterator(0, 26)); $nestedIterator->addIterator(new IncrementIterator(0, 26)); $nestedIterator->addIterator(new IncrementIterator(0, 26)); $nestedIterator->addIterator(new IncrementIterator(0, 26)); foreach ($nestedIterator as $current) { var_dump($current); }
based on C3WHs
Output for 5.0.0 - 7.1.0
array(4) { [0]=> int(0) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(1) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(2) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(3) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(4) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(5) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(6) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(7) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(8) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(9) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(10) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(11) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(12) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(13) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(14) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(15) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(16) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(17) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(18) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(19) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(20) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(21) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(22) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(23) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(24) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(25) [1]=> int(0) [2]=> int(0) [3]=> int(0) } array(4) { [0]=> int(26) [1]=> int(0) [2]=> int(0) [3]=> int(0) }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/noLO6 on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/noLO6 on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/noLO6 on line 2
Process exited with code 255.