AppendIterator::__construct

(PHP 5 >= 5.1.0)

AppendIterator::__construct — Constructs an AppendIterator

说明

public AppendIterator::__construct ( void )

Constructs an AppendIterator.

参数

此函数没有参数。

返回值

没有返回值。

范例

Example #1 Iterating AppendIterator with foreach

  <?php
$pizzas    = new  ArrayIterator (array( 'Margarita' ,  'Siciliana' ,  'Hawaii' ));
 $toppings  = new  ArrayIterator (array( 'Cheese' ,  'Anchovies' ,  'Olives' ,  'Pineapple' ,  'Ham' ));

 $appendIterator  = new  AppendIterator ;
 $appendIterator -> append ( $pizzas );
 $appendIterator -> append ( $toppings );

foreach ( $appendIterator  as  $key  =>  $item ) {
    echo  $key  .  ' => '  .  $item  .  PHP_EOL ;
}
 ?>

以上例程会输出：

0 => Margarita
1 => Siciliana
2 => Hawaii
0 => Cheese
1 => Anchovies
2 => Olives
3 => Pineapple
4 => Ham

Example #2 Iterating AppendIterator with the AppendIterator API

  <?php
$pizzas    = new  ArrayIterator (array( 'Margarita' ,  'Siciliana' ,  'Hawaii' ));
 $toppings  = new  ArrayIterator (array( 'Cheese' ,  'Anchovies' ,  'Olives' ,  'Pineapple' ,  'Ham' ));

 $appendIterator  = new  AppendIterator ;
 $appendIterator -> append ( $pizzas );
 $appendIterator -> append ( $toppings );

while ( $appendIterator -> valid ()) {
     printf (
         '%s => %s => %s%s' ,
         $appendIterator -> getIteratorIndex (),
         $appendIterator -> key (),
         $appendIterator -> current (),
         PHP_EOL
     );
     $appendIterator -> next ();
}
 ?>

以上例程会输出：

0 => 0 => Margarita
0 => 1 => Siciliana
0 => 2 => Hawaii
1 => 0 => Cheese
1 => 1 => Anchovies
1 => 2 => Olives
1 => 3 => Pineapple
1 => 4 => Ham

注释

Caution

When using iterator_to_array() to copy the values of the AppendIterator into an array, you have to set the optional use_key argument to FALSE . When use_key is not FALSE any keys reoccuring in inner iterators will get overwritten in the returned array. There is no way to preserve the original keys.

参见

AppendIterator::append() - Appends an iterator