PHP Design Pattern Series - Iterator_PHP Tutorial

PHP iterator:
Helps in the construction of specific objects that provide a single standard interface for looping or iterating over any type of countable data. (Not particularly commonly used, in PHP)
Usage scenario:
1. Access the contents of an aggregate object without exposing its internal representation.
2. Support multiple traversals of aggregate objects.
3. Provide a unified interface for traversing different aggregate structures (i.e., polymorphic iteration).

PHP code implementation:
[php]
//Iterator: helps construct specific objects that provide a single standard interface for looping or iterating any type of countable data
class MyIterator implements Iterator {
       
Private $var = array();
       
Public function __construct($array) {
$this->var = $array;
}  
       
Public function rewind() {
           reset($this->var); 
}  
       
Public function current() {
$var = current($this->var);
              return $var;                           }  
         
Public function valid() {
$var = $this->current() !== false;
         return $var;
}  
       
Public function next() {
$var = next($this->var);
          return $var;
}  
       
Public function key() {
          $var = key($this->var);
              return $var;                           }  
}
$values ​​= array('a', 'b', 'c');
$it = new MyIterator($values);
foreach ($it as $a => $b) {
Print "$a: $b
";
}
?>

Author: initphp

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