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  1. <?php
  2.  
  3. class ZipIterator implements \Iterator
  4. {
  5.     const ZIP_ALL = '{6087F687-D674-4549-AFBF-8D4DC07FE06F}';
  6.  
  7.     private $_iterators;
  8.  
  9.     private $_zipAll = false;
  10.  
  11.     public function __construct()
  12.     {
  13.         foreach (func_get_args() as $argument) {
  14.             if ($argument === self::ZIP_ALL) {
  15.                 $this->_zipAll = true;
  16.             }
  17.             else if (is_array($argument)) {
  18.                 $this->_iterators[] = new \ArrayIterator($argument);
  19.             }
  20.             else if ($argument instanceof \Traversable) {
  21.                 $this->_iterators[] = $argument;
  22.             }
  23.             else {
  24.                 throw new Exception("All arguments to ".__CLASS__." must be arrays or implement Traversable.");
  25.             }
  26.         }
  27.     }
  28.  
  29.     public function current()
  30.     {
  31.         $result = [];
  32.         foreach ($this->_iterators as $iterator) {
  33.             $result[] = $iterator->current();
  34.         }
  35.  
  36.         return $result;
  37.     }
  38.  
  39.     public function next()
  40.     {
  41.         foreach ($this->_iterators as $iterator) {
  42.             $iterator->next();
  43.         }
  44.     }
  45.  
  46.     public function key()
  47.     {
  48.         $result = [];
  49.         foreach ($this->_iterators as $iterator) {
  50.             $result[] = $iterator->key();
  51.         }
  52.  
  53.         return $result;
  54.     }
  55.  
  56.     public function valid()
  57.     {
  58.         foreach ($this->_iterators as $iterator) {
  59.             if ($iterator->valid() ^ !$this->_zipAll) {
  60.                 return $this->_zipAll;
  61.             }
  62.         }
  63.  
  64.         return !$this->_zipAll;
  65.     }
  66.  
  67.     public function rewind()
  68.     {
  69.         foreach ($this->_iterators as $iterator) {
  70.             $iterator->rewind();
  71.         }
  72.     }
  73. }
  74.  
  75. $a = [ 1, 2, 3 ];
  76. $b = [ 'foo', 'bar' ];
  77.  
  78. foreach (new ZipIterator($a, $b) as $pair) {
  79.     echo implode(" ", $pair)."\n";
  80. }
  81.  
  82. foreach (new ZipIterator($a, $b, ZipIterator::ZIP_ALL) as $pair) {
  83.     echo implode(" ", $pair)."\n";
  84. }
  85.  
Success #stdin #stdout 0.01s 20520KB
comments (?)
stdin 
Standard input is empty
stdout 
1 foo
2 bar
1 foo
2 bar
3
https://ideone.com/LJs7c2
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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